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		30-Jul-10		I am building a new home, 5791 sq ft total, broken out as follows: main floor 2116 sq ft; daylight basement 2116 sq ft; upper bonus room 816 sq ft; garage 743 sq ft in Eglon, WA. I believe I'd like to heat/cool with a heat pump. What size unit will I require to adequately handle this project? Puget Power is telling me they need to know the LRA rating of the unit I'll be installing before they will give me electrical hookup. They have provided a number of 65 as being safe, but I have a feeling that is a low ball number. Can you please advise me as to what I need. Thanks, dave johanson
		27-Jul-10		im in the process of buying a home .the home had a very bad mold problem. the home was just built in 2007 . Due to mold problem the air handler an very small amount of duct work was removed. The system that came with all units in village. The trane xb13 outside unit is still there all copper lines are were the air handler should be.DOES THE AIR HANDLER HAVE TO BE TRANE.OR CAN I PURCHASE ONE THAT IS NOT MADE BY SAME COMPANY THAT WOULD BE COMPATIBLE .
		25-Jul-10		I have a old lennox ground condenser on a double wide trailer the numbers are all gone on the ID plate,In the inside wiring diagram to the best of my ability has a HS9-461 series wiring diagram, last winter I bought the house and the compressor went out I need to find out the size of the unit and if a carrier unit I had on another rental will interchange, that unit ID plate is model 38ycc036300 ser# 2897e21051.. If you can help me out that would be great thank you g kirkpatrick....
		21-Jul-10		We purchased a 3200 square foot home (two story and basement)which was built in 1995 and has one unit for a/c and heat. We will eventually add another unit for the upstairs. My question is for now, how do we get the upstairs to cool in this 90+ degree heat we are having? The first level seems to cool well, it is just the upstairs that is warm.
		19-Jul-10		Is there a device you can install on your furnace that will convert a two ton a/c unit setup over to a four ton unit without replacing the furnace?
		10-Jul-10		how much freon does a 5 ton ac unit use with 20 ft of freon lines?
		14-May-10		What is the amperage for a 4 ton 14 seer HVAC unit.
		11-May-10		I have an Intertherm AS series power miser self contained air conditioning unit. The unit will come on and cool and the condensor fan will run. It seems when the unit gets hot and the condensor fan needs to kick back on it won't. I had an ac repairman out to look at the unit but it was rianing and he said he couldn't open the unit in the rain. He said it was probably the capacitor and would come back later in the week when it wasn't raining to replace it. He never came back so I replaced it. The unit started fine and was cooling with the condensor fan running and once it got hot and needed to kick on again same problem. Condensor fan motor spins freely when the unit is off. Any suggestions?
		07-May-10		How do you determine what size capacitor to use on any given condenser
		13-Apr-10		We have 17.5 TON AIRCONDITION UNIT . What is the max distance between internal and external units ? What is the max length pipe i can run between internal and external units. Please advice.
		27-Mar-10		I have a 3.5 ton Rheem compressor for A/C. Model 13ASA42A01 SERIAL #: 7280N370603682 DO I NEED A 40 AMP OR 45 AMP BREAKER IN MY ELECTRICAL PANEL FOR THIS UNIT? THANKS. ALVIN CANNADY
		20-Mar-10		Are Carrier, Bryant and Payne the same? This is quite important as a cancer pqatient will be coming to our home in three weeks so we need to make a decision and get it installed asap. Zoning a new 1.5 ton heat pump from basement to 2nd floor of home. Basement has 880 sq ft and upstairs has open bedroom with frog with door which is closed the majority of the time Heat pump has died upstairs and we thought since need to replace that we would have it zoned to basement area as well. Heat pump is located beside the finished part of the basement in an unfinished area so all ductwork is already going upstairs and has cooled and heated quite well.
		13-Mar-10		i need to change the heating system in my home.i want to use baseboard radiators so my question is,can i use a normal electric hot water heater to supply the heaters?my house is 900 sq feet and it is located in the province of newfoundland,ca. thanks
		14-Feb-10		I just installed a 3.5 Ton Goodman AC/Heat pump and My return is 20x25 is this sufficient for this unit
		09-Feb-10		I have two 2 1/2 ton Trane 1200 seer heat pumps. Can you give me a reasonable estimate of their BTU ratings?
		02-Feb-10		My sister has an older house and desperately needs a new evap cooler. The house is about 1800 sq ft. What size cooler will work best?
		19-Jan-10		We have a new class 1000 clean room to install and i am trying to calculate the costs associated. The room size is 200 square feet. We would like to keep the temp witin 5 deg. f What size (ton) hvac would be appropriate?
		19-Jan-10		Can a fireplace insert be installed instead of building a regular fireplace?
		07-Jan-10		I own a cape code house where the basement contains a furnace that provides steam to radiators on my first level. Two years ago, I finished off the attic area to make a bedroom and a local plumber ran a loop off the furnace that connects to a section of baseboard to be heated by hot water. Ever since this has been assembled, the baseboard section bangs like crazy when the upstairs is pulling the water through it. My question is, is this an acceptable design or is the design incorrectly setup as it should not use baseboard hotwater units to heat it? Also, what is the best and most economical method to heat the new room: steam radiators, electric radiators... etc? Thanks, David
		22-Dec-09		how much freon does a 5 ton goodman hold? Self contained AC and Heat pump W/heat strip.
		20-Dec-09		i had a carrier heat pump unit in my condo with a Magic Pak unit the unit is quite noisy when in operation. the company that installed it has checked and states that is how they operate. I spoke to other unit owners and they have same issue. Is there any way to deaden sound.
		11-Dec-09		I would like to propose a system of components which will capture solar heat during the day, deliver the heat to a radiator for immediate heating needs, and store the surplus heat in an 250 gallon insulated tank (r-30)for night-time use. 1. Use a mixture of water and antifreeze as the heat transfer medium. 2. Use a solar collector to absorb heat from the sun. 3. Use a circulating pump to move heat to the storage tank, and a second pump to move heat to the radiator. 4. I would like to get the water mixture as hot as possible to have heat throughout the night. 5. I need make an informed estimate on the size of the collector, and the size of the pumps. Given the fact that I live in Lufkin Texas and would like to the to provide enough heat to keep a small 1000 sq foot home insulated to r-30 specs at 72 F when the temprature outside is 32 F.
		14-Nov-09		goodman gmv950905dx variable 2 stage gas furnace and 3 ton heatpump split system. set so high cool is 1210cfm, low heat 1238cfm, (low cool will be 787cfm and high heat speed will be 1782cfm) what size main trunk line off the furnace plenum should be used to start the ductwork(branches of the main trunk line will go to rooms)? the low and high heat cfm need to be between 0.1 and 0.5 static
		10-Nov-09		how do i figure what btu i need to heat my basement with gas
		28-Oct-09		how do you find the duct size for the sq foot of a room.
		21-Oct-09		percent outside air if outside air temp is 20 f return air temp is 72f and mixed air temp is 65f
		11-Oct-09		We have a Rheem air condition unit Model number RPPA 049JAZ. When we turn the heat on the unit will run for about 5 minutes and compression shuts off but the inside fan remains on. We need to go out to the unit and reset the system. What size wire should be connected from the system to the fuse box? We were advised this may be the problem but did not let us know what size wire is needed. Thank you for your time. Bruce
		29-Sep-09		Simple question. I am getting a 15 SEER - Payne AC. I need to know how big the tonnage should be for an 1800sf living area house? Thanx. Rob, Orlando, FL
		18-Sep-09		I have an 800 sq ft house that is only heated by a gas vent free fireplace that kicks out 30,000 BTU's. What is the temperature that this fireplace will heat up my home? Thank you!
		14-Sep-09		We have a 1450 sq. foot ranch house. Our heating and AC company wants to put a 21 seer ac unit in. Is this recommended or is this just recommended so they can make more money.
		01-Sep-09		how do you determine proper size of register or registers to cool a room. 12ft x 18ft with 10 ft ceilings
		10-Aug-09		I have a York fan coil with model number AHP30B3XH21A. how many tons is this unit so i know what size i need on outside?
		04-Aug-09		central florida home 1500 sq. ft. has 4 ton unit,is that to big?light bill is 500.00 a month
		01-Aug-09		Hi I have a 1200 sq foot townhome how big should my furnace be?
		29-Jul-09		how do i determine how many btu unit heater i need for my warehouse that is 5300 square feet
		29-Jul-09		how do i determine how many btu heaters i need in my warehouse that is 5300 square feet
		24-Jul-09		I have an existing 1700 sq. ft house in palm springs, ca. Is the 5 ton ac too much and how many sq inches of return should it have
		20-Jul-09		Trying to find out the tonnage of a Ruud Model# UHQA1010B
		06-Jul-09		I have 2 heat pumps. How many BTU's are they? They are both Rheem one is model number RPLA-049JAZ the other is model # is RPLA-037JAZ
		02-Jul-09		Hi. I'm looking for a quick and dirty guide for BTUs needed to heat an institutional-sized building, understanding that the actual calculation is a great deal more involved. institutional-sized buildings. Professionals must come in with some preconceptions which need to be refined. What I'm looking foris those preconceptions. Thanks for any guidance. Mark
		28-Jun-09		How do I figure the B.T.U. s needed to heat an area of a home in my area of the world
		28-Jun-09		I am building a house from trusses. Wood exterior and using 4 x 8 sheets of bead board for the inside walls. there is 1200 square feet on the main floor with 18 foot ceiling and 14 feet walls. There will be a 250 square foot loft. The house plan is a totally open except for 500 square feet witch will have 9 foot ceiling in the bath and bedroom What size airconditing unit do I need to heat and cool this house. I plan to have gas heat. Thanks Carol The contractor I had planned to build this house was in an accident and I have had to do the whole thing by myself. I am overwhelmed.
		17-Jun-09		We have a 2000 model Ruud central air conditioning unit that is freezing up. Serviceman has added freon and checked for obstructions. Has not solved problem. We keep our thermostat on72 during day and 68 at night.
		17-Jun-09		I live in South Alabama, hot, humid days and muggy nithts. I have an 1800 sf home. Brick design and has moderate installation with some shade. What size central unit should I install in my home?
		15-Jun-09		i have a 1000 sq foot building that is well insulated but has never had a/c what size unit do i need
		08-Jun-09		What amperage should I expect to see on a clamp on ammeter on a 18000 Btu central air conditioner ?
		28-May-09		I bought a house in September in Dallas. It had a new compressor that is 3-ton generic. It looks like the coils are 4ton sized. I found out that the owner did this to get by. The house is 1875 sq ft. I have asked several HVAC contractors with a vested interest in selling me somthing and I get these four options. One, wait till Summer and see if it keeps up with the heat. Two, replace the compressor with a 4 ton R22 unit for about 3500. Three, replace the entire system with the new system at 13 SEER. cost about 7500-8000. Four, replace the entire system with the new system at 21 SEER. Cost about 10000 with a 1000 rebate and a 1500 tax credit possible. What would you do? How cheap should a be able to get a R22 4 ton compressor? There has to be deals if this type of compressor is going away this year. No one quotes prices over the phone. They want to sell you a system. Do I need anything right now? Thanks, TNT
		25-May-09		Can we replace a 2 1/2 ton unit with a 3 ton unit without replacing our existing coil?
		29-Apr-09		how do i find the size and energy use for a window unit that is to heat and cool one office.
		17-Apr-09		I have a bad air handler. I was told that i can get a new air handler with a 410 coil to work with my 7 year old tran ac unit. Is this possible? will i have any problems later when i upgrade my ac unit to a 410 unit?
		15-Apr-09		i have a 2300 sq ft. home ,what size unit should i get 4-ton or 5-ton
		09-Apr-09		I have 1,3000,000 BTU per hour. I need to convert this to GPM. Can you help me. Thanks, Nancy at Precision Pump & Vavle.
		08-Apr-09		How big of a central heat and air unit would I need for a 1600sq foot house?
		28-Mar-09		Will a 13 SEER 2 ton compressor work with a 10 SEER 21/2 ton evaporator coil/
		27-Mar-09		What size of A/C unit do I need to cool 1500 Sq Ft.
		26-Mar-09		we are installing new heating and ac units in our house and when we redid all the duct work for the upstairs low and behold thier was no return air flow to the heater and the return duct work coming from out heater was cut off just on the other side of the wall-so we are planning to make one so here the ? i have for everyone how big does the return has to be for a 700sq ft of space with five rooms branching off the hallway-or can i just put a 6'duct in the wall with a filter and grid on the outside of the wall
		25-Mar-09		I am trying to find info on a Comfortmaker Propane Heat Pump model# HPS042A2B2 and model #FBY043GB2. I would like the SEER and tonage information and any other info that would help determine energy efficiency. Thanks
		24-Mar-09		What size heat pump do I need for a 3000 sq. ft house?
		10-Mar-09		how bad does a old outside condenser unit effect the cooling of my house? i have installed a new inside unit already..
		15-Feb-09		my trane heat pump is leaking water on right side underneath of it.Any ideas?
		08-Jan-09		is it possible for a Ruud furnace to emit freon into a home?
		07-Jan-09		I checked at least 20 questions similar to mine... no answers... Does anybody even read them?
		06-Jan-09		We are installing a Rheem pne048J heat pump (4 ton,13 seer). The compressor will be about 30' from the indoor coil. Difference between indoor coil height and compressor will be about 3-4'. What size line set should I get. I read the manual butwant to double check with someoe more knowledgable in HVAC. I am only doing the electrical and grunt work. I will have my daughter hire some one to braze the copper,charge the system and do startup.
		30-Dec-08		We are installing a Rheem pne048J heat pump (4 ton,13 seer). The compressor will be about 30' from the indoor coil. Difference between indoor coil height and compressor will be about 3-4'. What size line set should I get. I read the manual butwant to double check with someoe more knowledgable in HVAC. I am only doing the electrical and grunt work. I will have my daughter hire some one to braze the copper,charge the system and do startup.
		04-Dec-08		i am in the process of replacing a 20 year old straight AC and heat system...compressor outdoors with evaporator coil and gas furnace underneath the house in crawl space. The system must heat and cool 1850 sq ft in Athens, GA. I am considering two possible systems...straight heat pump or heat pump supplemented by gas furnace. Will the electric supplement provided by the straight heat pump system be adequate for this climate without excessive cost? or...would you recommend use of hybrid system, heat pump supplemented by gas furnace? In other words, will the cost of running supplemental heat with electricity exceed cost of running supplemental heat with gas? And will the heat provided by the electrical supplemental heat do a good enough job of heating the space? I have always had gas furnace heat but would like to move to the most energy efficient system possible without sacrificing quality of the heat and air provided. I also have never had a heat pump. Are they reliable? dependable? really capable of the energy savings people are leading me to believe? Any advise will be appreciated.
		02-Dec-08		On a carrier rtu with gas heat I get the code for ignition lock out failure how do I fix that problem?
		01-Dec-08		Our office space is a completely brand new build out of approx. 900 sq ft and a new 5 ton HVAC unit was installed. We have too much velocity and it is freezing cold air coming out when it runs on a short cycle of 15 minutes on/off (when on it runs approximately 15 minutes and is way too cold). We have four rooms with two supply and one return in each of our counseling offices (with doors closed 99% of the time in meetings). One kitchen area with one supply/return (and a closed door 100% of the time), and a small waiting room with one supply/return. Our landlord added one supply to one of the counseling offices that originally had one one due to initial complaints but wouldn't do anything else. We hired an outside HVAC installer for an opinion and he says 5 tons is in excess and too much for this space with virtually minimal to none equipment giving off heat or anything. It is suggested to add another supply to even out the flow a bit but the concern is it will add more very cold air. Even if we add a zone system it seems it would potentialy freeze up the unit. Do you see any options here?
		01-Dec-08		I need to know what the range the industry charges to replace a compressor on a 5 ton 12 seer comfortmaker gas package unit first purchased and installed September 2002. Compressor is still under warranty. Thank you in advance!
		26-Nov-08		Around 1985, I attended an refer. class in which we had a working modle of a tube lite buld which would heat or cool. what was it and is it acailble?
		23-Nov-08		Hello, I have 2 Carrier Infinity 21 central a/c units with 96.6% afue 58MVB040-14 40k btu gas furnaces and CNPVP3621 evaporator coils. Both units have roof top condensers. One condenser is about 10' directly above the evaporator and the other is about 30' above the second evaporator. My previous air conditioning had a 3/8" liquid - 3/4" suction lineset. Carrier specifies 7/8" suction lines with an upsize for the unit where the condenser is more than 20' above the evaporator. My contractor (a Carrier Presidential Award winner) says the current lineset is adequate. My concern is that a 3/4" line only carries 74% of the amount of refrigerant gas that the 7/8" line carries when the gas is at the same temperature and pressure and only 56% of of the amout of refrigerant as a 1" line carries when the refrigerant is at the same temperature and pressure. Since these units are rated at 19 SEER when installed per manufacturer specification I am afraid that a) I will take a hit on efficiency and the units will cost more to operate because they will deliver less BTU's per watt, b) in the event of premature condenser or TXV failure Carrier will not honor the warranty because the units were not installed in accordance with their specifications and c) the units will wear out faster because of increased pressure differential between the liquid and suction sides due to undersizing of the suction lines since these units are rated with the line sizes stipulated by Carrier. In addition, Carrier states that the filter drier is to be installed INSIDE just upstream of the TXV and the contractor has already installed the filter driers OUTSIDE at the condensers. My concern is that the TXV will be more subject to clog due to copper oxide sloughing since there is a lot of liquid line between the drier and the valve. I have requested that the contractor replace the suction lines and move the filter driers which I can't imagine them not doing because the contract states equipment will be installed per manufacturer specification. They are good guys with a great reputation but it is the same case as I have observed with a lot of technical workers. They do NOT read or follow instructions and specifications and do things the same way they have always done them. My question is this - is it overkill to install suction lines this size on these 2 ton units (recall they are rated at 19 SEER) and if you were me would you insist that they be installed and the filter driers be moved per manufacturer installation specifications? Thank you! Regards, Ed Scherer
		14-Nov-08		I have a raised ranch. The upper level is 1500 sft. Open floor plan except bath and 2 bedrooms. I am looking at a Rinnai 1004FA 10,000 to 38000 BTU I do not know how many BTU I should have for the upper level. I have a 1004F on the lower level. Thank you
		14-Nov-08		I have a Fedders 2 stage high efficiency gas furnace that is about 6 years old. I need to extend the exhaust PVC pipe on the outside up about 4 feet. The pipe now is about 1.5 feet from were it comes out now. I live in eastern PA and did know if there would be a condensation problem or the length would not be allowed because of the furnace. Does anyone know if this is possible to extend? Keith
		12-Nov-08		what size unit would be best for an area of about 1900 square ft. i'm looking at a goodman package unit.
		31-Oct-08		How do I calculate BTU's needed to heat a house
		30-Oct-08		I am negotiating a lease for my business. It is nearly 6,000 square feet. The landlord says the central a/c/heat is switched off at 6pm every night and altogether on weekends. My business is open 6pm-11pm and Sat/Sun all day. What are my options.
		30-Oct-08		I have a 8 year old Goodman 1 ton outside unit. Can I replace it with a 13 seer unit without replacing the unit in the atic?
		26-Oct-08		My Carrier Furnace is leaking water from the area under the blower. We have checked all the hoses to make sure they are clear. Took off a little black canister on the front where two short hoses go into and the main drain that goes under the house - all are clear. This includes the line under the house. We still can not find out where the water is coming from. Any help or is it time to call a professional? JaNay Newton
		25-Oct-08		I recently (July, 2008) had installed my first HVAC system. It was a 3 1/2 ton Carrier Infinity unit. My house is one story, measures 27' x 52', has newly installed energy efficient windows and doors. Now that I'm using heat, my two bedrooms on the end of my house (northside) are cooler than the rest of the house. They each have one heating vent in them. One room measures 13' x 14' and the other is 13' x 16'. Should another vent be placed in each room? There are two windows per room also. The vent is under only one in each room. The two windows without a vent under them stay very condensed. How do you figure the calculation per room to know how many vents are needed? Is there something that is used to measure the flow from each vent in the home to ensure consistency? If so, that was never done. Your help is greatly appreciated!!!
		09-Oct-08		Trying to evaluate heating requirements for 36'x 48'x 24'h open space; 100kBTU oil furnace kaput;Rinnai space units have been suggested; at 10k BTU's how many required? There are ceiling fans in the sanctuary.Space is used max of 6 hrs. p/wk. Thanks, Pastor Henry
		02-Oct-08		Since you never post answers to questions you are as useless as big tits on a Nun, arent you?
		02-Oct-08		What compressor goes in a Trane TTA042C300AD? I don'y have any specs as my customer is not knowledgeable in the HVAC field. Any help would be greatly appreciated. Thanks.
		01-Oct-08		how much in ton air condiction do i need for 1300 sq ft up stairs w/four room
		30-Sep-08		My 16 yr. old heat and air pump is leaking and my home warranty repair company, just keeps sending a repairman to add freon. It is leaking inside my home and I do not want this. I have offered to pay for a new unit and for them to give me the amount they will pay on the purchase. They claim is is find and just to keep calling for repairs, which is always freon. I thought we had laws to stop this and to protect our air. I called EPA and not much help from them. Seems no one cares! Appreciate your advise. Thanks, JP
		26-Sep-08		I want to install a mini split system in an office room where the copy and print machines are located. The calculated heat load from these machines is 25,000 btu's. how much ton of refridgeration do I need?
		24-Sep-08		NEED TO REPLACE MY FURNACE, BUT DON'T KNOW WHAT SIZE TO GET. HOW DOI FIGURE THIS OUT?
		23-Sep-08		dear sir, we can placed a 17.5 tr air conditioning unit with R22 refrigerant for 3000 square fit area room which having the 40 degree celsius temp. the inlet air in this air conditioning unit is coming with 40 degree celsius and and the discharge side temprature is 22 degree celsius after passing through cooling coil.so how much time is taken this machine to reduce this room temp. 40 degree celsius to 30 degree celsius.giving all the technical detail.
		18-Sep-08		What is the standard air exchange rate in a comercial building bathroom? I was told that 10 airchanges per hour was standard.
		17-Sep-08		I'm supposed to close on my first home tomorrow and they had to replace the 15 year old gas furnace with at HEAL Heating and Cooling unit. the house has a 800 sq foot finished basement, 800 sq ft main flot and 300 sq ft upstairs in Kansas City MO. I plan on putting new double panel windows in this fall. The BTU input for this furnace is 95 BTH/HR. Is this large enough because the physical size of the unit is smaller than the old one ?
		16-Sep-08		what size heating and cooling unit would it take to heat a 950 square foot home ,electric
		15-Sep-08		I have central air and oil heat. My air handler is located above my furnace. Can I convert my central air unit to heat also without replacing the condenser unit?
		15-Sep-08		We have a 220 ton Carrier chiller and a 400 ton water tower make by BAC. Is it cheaper to run the tower than the chiller and how much cheaper is it to run the tower.
		11-Sep-08		hi, My name is Ron Bollinger. I'm a maint.tech at MWV (meadwestvaco)located in south centeral pa. We have 2(200) ,1 (250), & 1 (300) hp screw air compressers with large built air to air exchangers to cool the compressed air.The blowers are 48" in dia. turning at 875 rpm. with 9 blades per fan. I took temp. readings at the output of the exchangers & they are 190,190,170,&168 degrees fairenhit. Now thats a lot of hot air ! we are currently venting this to out side. Any way I need a BTU value.I'd be very thankfull for any help in this area.Thanks for your time Ron
		08-Sep-08		What size heat pumps might we need in a new church in the mountains of western NC aprox. 3000 sq. feet upstairs plus 3000 sq. feet downstairs (total 6000sq. feet), upstairs are classrooms, downstairs are offices and a small fellowship hall. Average parishoner attendance is 75 people. (different companys are quoting different capacities)
		03-Sep-08		Hello, I need a calculation to figure out a warehouse area that I need to exchange the air six times per hour in the building. Also, can you recommend any equipment that would help facilitate the process. Thanks.
		24-Aug-08		how to calculate heat load of a computer,LCD monitor and CPU
		22-Aug-08		would I be correct to say a 360gpm secondary pump is not sufficient to serve two 3500mbh boilers through a 6" main?
		18-Aug-08		How do I determine the AC requirements for a house of 1574 sq. ft. Thank you!
		16-Aug-08		We have a duel fuel furnace, it has been changed 2 different times in 6 years, now a local contractor states the ducts need changed. Does not heat/cool 2 rooms or the basement. We have 1800 sq ft downstairs and 1800 sq ft upstairs. What do you think we need?
		15-Aug-08		I have 2 two ton Rheem 12sser heat pumps outside and 2 two ton Goodman gas furnaces in the basement. I had some local heating & air companies give me an estimate on setting the system up for dual source heat changing out the thermostate. The Rheem units had originally used the 3/8in copper tubing but when install with the previous gas furnaces they reduced them to 1/4". The Goodman furnaces have the coils that can be used with heat pumps. The repairs guys said the heat pumps with the thermostate can be set up to work as the primary heating source with the new honeywell thermostate and the gas furnaces will become the backup heat for when the temp gets below 35 to 40 degrees. They said we need to remove the old 1/4 " tubing and install the 3/8". The heat pumps have been working for 7 years in ac mode with the 1/4 lines have have worked fine. I agreed to them changing them out since it should be more efficient. After the repair guys left, I noticed they left about 2 to three inches of the 1/4 tubing next to the outside heat pump units but replace the rest of the line. Is this any different than before. It doesn't appear to me we have accomplished anything by changing out the line since we still have a few inches of 1/4 inch line. What should I do? Since the ac works great now and did before with the line between the AC and the furnaces being 1/4 inch is it going to make a difference when we start using the heat pumps in the winter to heat the home. Thanks for all your help. Joe
		15-Aug-08		I would like to have an air conditioner installed in my 3000 square foot home (two-storey with finished basement)... I am not sure how large of a unit I would need?
		11-Aug-08		how big of an AC unit should we need for a server room that is 13 X 17.7 with approximately 30 servers in it which is about 8 server rack the produce about 3.5 kw per rack. thanks
		11-Aug-08		I an trying to determine the correct size of roof air conditioning unit to properly cool a room approx 10 x 12 ft in size. It is a server room housing approx 25 to 30 servers). Is there a tool I can use to configure this???
		10-Aug-08		I have a 2300 sf house in Hartford CT, i would like like to know the BTU output /(size of furnace to heat the house) the existing system if a forced air oil furnace. Thanks
		07-Aug-08		I have recently had two hvac repairs. One was a 2 ton 13 seer system and the other was a 3 ton 10 seer system. According to tech he put 5 pounds freon in each. Is this reasonable?
		05-Aug-08		I have a 1400 square foot single story house with a 3 ton unit and a single 12 x 24 return register. The unit is ~10 years old and is extremely inefficient (runs almost continuously when set at 80 or below). An A/C company recommended that I add another 12 x 24 return register (for a fee, of course) but can't explain the reason for that particular register size. They didn't perform any other diagnostic tests but claimed the unit is fine otherwise. Another company said the register is 'too smal'l and there are duct leaks as well as a coolant leak. What should I do?
		04-Aug-08		I recently had an AC issue with the unit making loud noise - York that is about 6 years old. Tech replaced the capacitor and charged me $239 for parts and labor. Is that reasonable? I don't have a clue about HVAC's but the part does not seem all that pricey when googled (approx $30). Any input is appreciated.
		28-Jul-08		I am building a new home and the square footage is about 1850sq. ft. it has a full walk out basement 1850sq. ft. I am putting in a goodman electric heat pump with a variable speed motor on the air handler. i have 8 36" by 66" windows across the front of the house and 3 across the back. the house doesn't have any shade around it. should i put in a 3 1/2 ton unit or 4 ton unit.
		26-Jul-08		What size trane unit do I need to cool 1200 sq ft house?
		24-Jul-08		The A/C unit is too big for the area it's cooling which causes high humidity. I have a dehumidifier running constantly but it's still really humid, usually 60-70%. How can I decrease the humidity?
		24-Jul-08		How many tons central air conditioner will I need for a 3300 squar foot home?
		22-Jul-08		does anyone still sell/make ductless split system air conditioners (1 ton) using R22
		17-Jul-08		What size air conditioner and furnace (blower) do we need for our house? Our house is one story and we also have a full basement that is 100% finished. Each level is 1464 sq ft, and the upper level also has vaulted ceilings and most the windows (which are probably average in number) are on the north and south sides of the house. Our current air conditioner (3 ton system) is working with the output at 55 degrees and the coil pressure is standard. The problem we have is that there is not sufficient air flow out of the vents to cool down the house. The system will run 24 hours a day and never cool to the desired temperature. (it will be 94 degrees outside and it will slowly creep up to 84 degrees inside even though we have the thermastat set at 75.) -Technician suggestions (we have had 3 people take a look) 1st technician-said the condenser was bad so we needed to replace evrything, including the furnace because the blower is not sufficient in size. -2nd technician-said only the air conditioning part of the system was bad. Wehen we mentioned what the previous tech said, he said he would get back to us after he had completed some calculations to see if the blower was sufficient. He never called us back. 3rd technician-he showed us the temperature and pressure readings and said they are exactly what they should be. "Mechanically, this is operating exactly how I would set up a brand new one." he did acknowledge that the air flow out of the vents seemed slow but has no clue what to do because "a 3 ton system is plenty for this size house." What do we do?
		14-Jul-08		How many tons is the York model E1Ra036S06D Heat Pump ?
		11-Jul-08		I recently built a 2000 sq.ft home. I have a 5ton Lennox heat pump I will be using in this home. Yes I know the unit is a little big for my needs. I have done heating and air for 10 years now, but I don't have alot of experiance coming up with a mechanical floorplan for this type of situation. If you could help me with this, I would appreciate it.
		08-Jul-08		Couple more questions. Would the evaporator system set up for puron be compatable with R22? I have a bottle because I used to Install comercial heating and air 20 years ago and fixed my last house a/c. Secound is what is the real differance between a heat pump condenser and regular. Does anything in the evaporator need to be replaced to use heat pump?
		08-Jul-08		Ok we have a house pre set up for A/C. Two story apx 1800 square feet. Two upstair bed rooms face afternoon sun with windows aprox 6 ft square.Rear of houes faces morning sun. House has 10 windows total and a SLIDING GLASS DOOR. All double pain.R 32 insulation in attic. Live in Yelm washington. we do have some 100 degree days. Bulider says a 3 ton condenser. How do we figure to see if this is correct size? Or can you?
		06-Jul-08		I AM INSTALLING A 2 TO 13 SEER GOODMAN HEAT PUMP IN MY UPSTAIR SPACE 900 SQ FT DIVIDED INTO 1 LARGE ROOM AND 1 ROOM 12 FT X 16 FT HOW DO I CALCULAT THE NUMBER OF VENTS AND HOW FAR APART THE TRUNK LINE WILL BE 12 IN REDUCED TO 6 IN AT REGISTER .ALL MOUNTED IN CIELING
		27-Jun-08		how do I change my indoor fan speed on a goodman package unit
		26-Jun-08		I am having the ducts redone in my home. Currently, I have 6" round diffusers in the ceilings, but I need to have a few more added, according to every consultation I have had. I'm fine with that, but one of the contractors I spoke with told me that I would need to replace the round vents and replace them with rectangular ones. He said that the rectangular ones were more efficient. Is that true? Essentially, it would mean he would have to cut in a new, rectangular hole in every room (two in some...) and then just plug up the 6" round holes somehow. My wife and I both would rather not do that if possible. Thanks so much for your help.
		24-Jun-08		I have a 1400 sq. ft. home. What size central heating/ aic conditioning system do I need?
		22-Jun-08		I need to build a room inside a warehouse. The room is ~5600sq ft. I need to maintain 68 degrees F and 45% RH 24/7/365. I need to maintain 6 air exchanges per hour on the assembly tables due to the resins that will be used to build composite panels ( s-glass, aramid, ceramic tile) for the defense industry. This will not be a "classed" clean room. The panels will then be cold pressed for ~ 2 hours until cured in the same room. What type of hvac system is required to maintain this area. Thanks, Tony Maloy
		21-Jun-08		what would happen if a 5 ton straight cool condenser is used with a 3 ton air handler with orifice?
		21-Jun-08		my Trane A/C unit recently started doing something strange. In cool mode occassionally it turns on the aux heat. during which time it actually heats rather than cools. It will do it while its already running (and cooling) and sometimes at start up. It will stay that way until I trip and reset the breaker(60 amp). If I don't, it will continue and heat up the house. I looked and there is no ice build up to melt. When the cool is working properly, it works great. What is wrong with my system? What can I check or fix? Please help, I can't leave my a/c running while not around to monitor the aux heat light. Last week we had temps in the 100's and this week in the 90's. Money is tight, so I do all repairs here. Is it my thermostat perhaps? Thank you for your time. --cheers, Ken C.
		20-Jun-08		I have a 14 by 70 mobile why put in smaller now? home... it has an 80 thousand BTU gas furnace now.. i got a quote for a new furnace and they recommended a 60,000 BTU intetherim furnace... is this big enough and will it heat as well as 80,000? thank you
		17-Jun-08		I have a lofted two story house 1919 SF with two HVAC units. My question is I live by myself and want to keep my power bill low so I was closing the upstairs bed rooms and bath room doors. But with the temp outside now in the 90's in S.C and higher I wonder if it to much strain for just one unit. So with that said I have turned on the upstrair unit and opened the doors and closed the blinds and set it to 79 and the down stairs unit on 78. Is this the right thing to do keep both units on and should I set one higher upstairs than the lower unit.
		17-Jun-08		What is the conversion factor for air-conditioning tonage per square feet in a comercial building with 8 feet ceilings.
		09-Jun-08		I was working on my sister's Lennox heat pump/AC system over the weekend and found an error on the circuit board the there was a pressure switch lockout. We attempted to get service but they are telling us it could be weeks! Is there anything I can do on my own to resolve this issue? Thank you, Fred
		08-Jun-08		Late in the afternoo when temp. are in the 90's my centeral air unit runs full time it stays cool but i'am warried it will hurt the unit could that happen. after the temp., starts dropping it returns to normal and starts shutting off and on. are these units made to run like this during very hot days.
		08-Jun-08		I have a 3.5 ton heat pump to cool 1600 sq. ft. and it just is hot getting the job done. I have increased the return size but, I feel that I don't have enough registers to produce the air. The house is 4 years old with R19 in the walls and flooring and R40 in the ceiling. Is there a formula for figuring how many registers I need?
		05-Jun-08		Hello, my air handler,located in a closet in the house above the hot water heater in Florida which has lots of humidity, leaks water from the sides. I had the coils cleaned and the drain is not clogged and yet it seems like the water from the coils in hitting the sides and forming puddles on the frame where the filter is and then leaking on top of the hot water heater. I have had 3 different companies not help me. Can you help, PLEASE???
		03-Jun-08		I want to replace my 23 yr old York AC unit. The data is worn and faded from the plate....is there any way to determine the tons of the unit????
		02-Jun-08		I would like to know the average price of a 5 ton, 18 seer Heat pump. For example, I am pricing a Lennox XP19 Heat pump including the condenser and entire system installed. Any ideas? Thanks.
		28-May-08		I have a fitness center I am putting up it is 17,491 sq ft. I want to put 1 ton per 300 sq ft. is this right the max amount of people in the space will be 275.
		27-May-08		i want to know how to calculate static pressure in duct system and how do chillers work ?? plzzz help me sir ...!!!
		25-May-08		What size usint do I need for a 3000 sq ft home? How about 2 story - 3000 sq ft? Thanks
		23-May-08		Will running chilled water through a centrifugal chiller during its off cyle damage it?
		21-May-08		What is the recommended tonage for a 2,000 sf home?
		21-May-08		Have a 1987 Trane 4 ton compressor/Ruud 5ton 2006 air handler UBHK; am now replacing the compressor (have 1800 sq feet (3Br/2Bth),vaulted ceiling in LR/DR):1)Do I need a 5 ton for this sq footage? 2)Will a 4 ton properly match my Ruud 5 ton air-handler? 3)Will a 5 ton require change in electrical wiring 4)How much more expensive will a 5 ton be on electrical bill? All AC contractors consulted have a different approach...thanks, Tom
		12-May-08		How much electricity does a Trane A/C Unit of 12.5 tons consume
		07-May-08		What size ac unit is needed for a 200 sq ft house 8ft ceilings?
		06-May-08		How many cubic feet will a 8.8 ton a/c unit cool
		01-May-08		Hi. I'm having trouble finding info on some Airflow watercooled server room units. I'd like to get some spec sheets.
		01-May-08		Is $3400.00 about right for a 3.5 ton Bryant R-410-A coil and 3.5 ton Legacy condenser. Price include istallation. Any input will be greatly appreciated. Thank You
		30-Apr-08		What is the average cost to install central heat and air conditioning in a 1400 sq. ft. home.
		25-Apr-08		I have a 360 sq. ft. bonus room that is supplied from the main system. There is an additional duct fan to provide more air as the supply is at the end of the main floor duct system. Even with the duct fan running, the bonus room stays 5-6 degrees warming than the rest of the house during the summer. There is no return duct from the bonus room. If I add a return duct through the attic, will this help to lower the temperature? Thanks, Mac
		25-Apr-08		the control board on my 2000 Byrant Furnace (80% Eff) went out. They want to charge me $500 for the board plus $128/hr labor for a scheduled call (non-emergency). Am I missing something here?
		18-Apr-08		Can two 3 ton a/c units cool a 3000 sq. ft. warehouse with 25 ft. ceilings?
		15-Apr-08		What is the right size of a central A/C unit for a 2088 sq ft, 3 bedrooms, all brick bungalow, with backyard having southern exposure? High ceilings 12ft in hallway, office and dining room and 10ft in the great room.
		01-Apr-08		Please list the advantages and disadvantages of RADIANT HEATING for commercial spaces and also, specifically for AUDITORIMS and THEATER SPACES. Thank you!!!
		31-Mar-08		How do I figure out the BTU's needed in each room of our VFW Post rooms. The wall's are made out of adobe brick. No windows and 1 door in each room. Looking for window shakers because we can't afford a centeral a/c. thanks
		27-Mar-08		What is the average size of an Central A/C unit for a 600 SQ. FT home
		23-Mar-08		HEY EVERYONE.. THERE IS NOBODY HOME HERE. THIS IS WORTHLESS. GO BACK AND LOOK THERE ARE NO ANSWERS ONLY QUESTIONS.
		05-Mar-08		How do you calculate the BTU's needed for a room size( example 10x10) when installing baseboard heating
		19-Feb-08		I'm trying to figure out how big a furnace is needed for my 2200 sqft home. What is the formula for figuring btu's per sqft? I have a home that is 5 months old, the heat (we're in Northern IL) is set at 68 degrees F and my gas bills are $250 a month. We are constantly cold in the house and the pipes in our second floor bathroom keep freezing. Thanks in advance
		18-Feb-08		I have a carrier furnace unit in my townhome, the model number is 58GP100-BA Serial number is 3989A16852. The blower motor keeps running after the heet shuts off. I had a serviceman stop over and he said the relay on the circuit board is shorted. We had a power outage last night, he said that probably had something to do with it, of course he said its probably cheaper in the long run to buy a new carrier unit, i don`t think so, i can`t afford a new carrier right now. From what i told you does it sound like i need to replace the circuit board, if so where is the cheapest place around the states where i can purchase one. Thanks..
		14-Feb-08		I am looking at purchasing a home with an electric heat pump. We live in Iowa where temperatures can dip way down in the winter. The brand is Gibson and the model #GB3BM-042K-B and the serial #GBB011001108. What are your thoughts on this?
		10-Feb-08		i have a 92% efficient luxaire furnace. it keeps blinking red 7 times the code means ignition lockout do to retry. can you give me some on fixing this
		10-Feb-08		how many btu,s would i kneed for 1500 square foot home
		31-Jan-08		I'am aking about the initial steps in order to pipe a commercial building using hot/cold water to vav boxes including gpm;determining the increase and decrease in pipe? What are some steps/books in learning this technique? Thanks
		31-Jan-08		Yes, I'am trying to understand the calculating of gpm?
		30-Jan-08		I just had a Bryant evolution 96i installed and have a problem with the program. During the sleep time the temperature set jumps 3 degrees - it is the same no matter what temperature I set it at - during the night I check it and it says 67 if I set it for 64, etc. Can you tell me what is going on? I have not seen this happening during any of the other programmed periods. Thanks
		29-Jan-08		I have a rheem 16 seer air handler.The low speed fan keeps running even if the thermestat is off,when the temperature drops in the attic.What can be causing this.
		29-Jan-08		There is a funny looking brass valve on my boiler that is leaking water. The tech replaced the valve 4 times aparently there was a bad run of them. It started leaking again, the tech said I should put a plug in the hole. I did it and he was right it stopped leaking, is this ok?
		25-Jan-08		i am trying to figure out how to find the formual to find the vent size when the btu's are given and the hight
		22-Jan-08		what is the formula to figure BTUs to square feet
		11-Jan-08		i am thinking of changing 3 oil furnaces to propane , we already use propane for our kitchen equipment and there is a separate line for the furnaces i would like to know if it would be cheaper to go to propane the price of oil is 93 cent and the price of propane is 68 cents does it take more litres of propane to heat or more litres of oil per square foot . i hope this is not a dumb question . thank you for your help
		04-Jan-08		What size BTU heating and cooling unit do I need to heat and cool a room 16x24?
		02-Jan-08		What size a/c heat pump system do I need for a three level 1500 square foot house? Are dustless heat pump systems efficient?
		02-Jan-08		I have a 14x20 room, a 14x10 r00m, a 14x14 room in a 1976 mobil home. I would like to put baseboard hotwater heat from my outside furnace, the windows have been replaced with thermo pane windows. How many BTU do I need to heat this?
		29-Dec-07		Have a Carrier AC unit it's Model# 24APA342A300, what size cooling & SEER rating? ANd maybe a heat Pump?
		22-Dec-07		We want to put radiant heat in a new concrete floor that is 20X38 feet. How do we lay out the tubes and how many feet do we want for each zone? Also how far apart should each loop in a zone be?
		18-Dec-07		I am replacing a 20 yr old Bryant Quietline furnace and would like to know how many BTU's at 90% eff., do I need for a 1900 sq ft home. Thanks, Keefe
		11-Dec-07		I HAVE 5 UNITS WITH MODEL AND SERIAL NUMBERS. I NEED TO KNOW HOW MANY TONS EACH UNIT HAS?????
		04-Dec-07		I have a homeowner who wants to know how many tons of A/C his two units are producing. The specs for his home say he should have 7 1/2 tons and he was told he has 6 tons. How do I calculate his tonage?
		01-Dec-07		I have a new home with gas heat, and A/C heat pump reversing valve. I live in Northern Illinois. When thermostat is set to heat, during cold outside temps, the gas is firing in the furnace, but the outside A/C is also making noise. Is this normal? Should I set to emergency heat only ?, which is gas only.
		28-Nov-07		How do I decide how many Btu output I need to heat 1000sq/ft building in northern NY.
		21-Nov-07		How many HVAC Tons required to cover 1oosft A/c area
		10-Nov-07		How do you calculate how many btu are needed for square footage?
		07-Nov-07		How do I determine what size of hvac system I need for typical office?
		No answers have been posted to this question.
		30-Oct-07		We have an old, too-big, 18 year-old, inefficient 165,000 btu Luxaire furnace which we would like to replace with a 95% high efficiency, variable speed furnace. Our house is 1800 sf on the main-floor and about 1200 square foot basement. It is a '50s ranch has vaulted, 12' ceilings and lots of floor to ceiling windows (original aluminum ones) and little insullation. We have 3 bids on furnace systems from 3 highly-recommended installers, and all high-efficiency (95%), variable speed furnaces but they range in BTU size from 70,000-130,000. Two questions. 1. We are completely confused on what size furnace to get and they are such a huge range of sizes, how do we know what size to get? Does the brand affect the number of btu's we should get? 2. The furnace brand is also in question. the brands we have bids on are Luxaire (they recommended a 120,000 btu's), Lennox (the least expensive and with the smallest btu's at 70,000) and Goodman (the most expensive and they suggested 115,000 btu's). Luxaire has the best warranty right now, 10 years parts and labor, so we are leaning towards that bid. Do you have suggestions on brand too? thanks!!!!!
		14-Oct-07		When I turn the gas on tothe furnace it blows the pilot light out how do I fix that?
		12-Oct-07		I have a Heat Pump LWA 80 and dbA 77 installed next to my house and Noise Inspector sais to ask a accustical expert about reducing the noise. The location of my Heat Pump is 4.5 ft from line of property and about 15 ft from the nighbor house. What I can do to comply with the city.
		05-Oct-07		What is the ideal Tons per sq ft for homes in Kentucky?
		28-Sep-07		Condominium complex hi-rise with split-type AC systems. Owners/tenants occasionally leave window open while running AC - causing a sliudge or 'snot' in the condensate drip pan which then clogs the outlet - resulting in unit flooding. This is in Hawaii. Any ideas on a fix or on preventative maintenance?
		14-Sep-07		I have a split level home and building an addidition above 1st floor. The total square footage of house will be 1552 sq. ft. How many btu's do I need to heat & cool house? Township permit requires this number.
		13-Sep-07		I live in Galax, Va. My new modular home carries a very good above average energy/insulation rating. It is a 2014 sq. foot, rancher style home. What size a/c heat pump unit should I put in. I believe the local A/C company is quoting too large of a unit at 3 1/2 to 4 tons. A friend has a similar home but is slightly larger in sq. footage he says his 3 ton unit is enough for him and certainly large enough for me. What do you suggest?
		09-Sep-07		I am a newly grad civil engineer, have just started working on a new 16 story residential condominium. I have no clew about the HVAC system major component, how it work, etc. Could some one refer me or explain to me briefly how the system work in plain language
		07-Sep-07		I have recently purchased a home with existing heat pump Comfort Maker Softsound 1200 model CHP230AKA1. It does not function properly i.e on very hot days it cannot bring the interior temperature below 27C (80F). I had HVAC contractor telling me that this heat pump is not sufficient capacity for my house, but he does not know its capacity. I was trying to find tonne capacity and SEER number for my machine on the internet without success. Can you help me? Thanks Lubo, Montreal
		30-Aug-07		Last August I purchased a new 3-ton condensing unit. Last week my freon was out and the dealer charged me for 10 pounds of freon in this unit. Others are telling me that I have been taken for a ride as it could not possibly hold 10 pounds of freon and that the maximum should be around 5 pounds. Is this so? Am I getting ripped off?
		28-Aug-07		What is the normal amount of square footage per tonnage? I thought it was about 1000sq.ft. per ton.
		21-Aug-07		how to charge my ac unit with r22
		14-Aug-07		is there an easy way to determine the necessary BTU's cooling for a server room?
		13-Aug-07		I live in central texas and i just bought a house.there is a 3 ton a/c unit,but is not cooloing good.I have high ceilings in the whole house and there is 4 large windows getting evening sun. Is a 3 ton unit enough?
		08-Aug-07		Good morning , I have a customer that gave me Bryant model # 100-511d when I googled it .It brought up your company .Can you tell me if this is a good model ? Or if there is another model number I should be using ?
		30-Jul-07		We need to cool a building that is used to service and repair vehicles. This building is 170' x 140' and has 22' side walls and 30' high in the center of the building. We do not know if exhaust fans will reduce the heat to make it fill cooler or if we should do A/C. It will cost about $30,000.00 to install exhaust fans and $89,000.00 for A/C. We are in West Virginia and have 3 months of very hot and humid weather. We also would like and idea of the operating costs for A/C Thanks, Doug
		24-Jul-07		How many tons of air are needed for a 6,480 square foot church sanctuary with a high vaulted ceiling and a balcony? One quote said 40 tons and another said 20 tons. We are not sure which is correct.
		23-Jul-07		I hired a qualified HVAC Company to replace my 4 ton 10 seer condenser because it was not working.He replaced it with a 4 ton 13 seer Gibson codenser. Is it a manufacturer requirement to replace the A-coil?
		20-Jul-07		How do I determine the correct charge for a newly installed heat pump system with R22 refrigerant. It came factory charged for 15 feet of lines. I'm using a new 35 foot line set. Is there a rule of thumb for R22 using ambient temp and a PT chart to determine what the pressures for the low and high should be?
		19-Jul-07		i have a southern facing mobile home (1344 SQ feet) in Las Vegas. Is a 4-ton Trane (13 SEAR) the recommended size?
		19-Jul-07		My Trane XR90 unit is leaking water from the bottom of the unit as well as the sides. I have vaccumed out the lines and turned the AC off and just left the fan running to defrrost the condenser if that is the problem. It is still leaking about a cup of water an hour and has done so for 4 day's. How do I check to ensure the sump pump is working ? Were could the water be coming from ? Is there any damage that can be caused by this ? Thanks,
		18-Jul-07		I have a new home @ 2500sf. What size a/c unit do you suggest? (Power, BTU's, etc) Thanks JS
		16-Jul-07		hi, i would like to know why a tech would put a bigger starter or copacitor on anew ac unit .
		14-Jul-07		i have a 3000 sq foot house with 18 + ceilings. we currently have a 5 ton unit outside and i need to check the one inside, but the question is? is that enough also it is a one story thank you
		14-Jul-07		I am in the process of purchasing a three story townhome. It is a 2400 sqft and has one 5 ton unit. I was told that I might need to have the system set up as a dual unit. Does that mean that I need to purchase a additional unit or does the 5 ton that I have, have two compressors?
		12-Jul-07		Is a 40000BTU furnace big enough to run a 2 ton ac unit?
		08-Jul-07		I'm looking to heat and cool and old theater with no existing system. It is approximately 10,000 sq. ft. and goes from aproximately 20 ft. high in the rear to 40 feet high in the front. It will seat approximately 300 - 400 persons. How many ton system(s) would I need and what kind of system would you suggest? Also could you guesstimate a cost for the unit(s)? THANKS
		07-Jul-07		Hello, I have a 5 ton AC unit for my 2100 sf ranch home in Phoenix, Arizona. From the reserach I've done, I think 1000 CFM of return are necessary. Presently, I have 450 square inches of return between 2 returns. I want to add additional returns and know I need to increase the square inches to 1000, but I'm not sure what size duct I would need attached to the new return(s). Please advise.
		06-Jul-07		How many btu's are needed to heat a 1100 square foot home?
		06-Jul-07		How many tons of cooling are in a 1400 HP Chiller, and can you provide the formula for future reference?
		05-Jul-07		I am using packaged water cooled chillers on the diff floors and cooling towers on the terrace.how would a vfd pump operate if used in the primary circuit ie to pump the water from the diff load to the cooling towers?.
		03-Jul-07		What is the easiest way to closely calculate the heat load in an electrical distribution room with large transformers, VFD's and disconnect buckets for the equipment in the plant?
		03-Jul-07		what changes need to be made to convert a 10 seer to a 13 seer. i work for a 55 and over property and i will be replacing the cooling unit
		03-Jul-07		How many pounds of freon 22 does a self contain home air conditioner hold?
		29-Jun-07		how many tons equates to 18000 btu?
		28-Jun-07		I have a commercial 2 story office with a new separtate AC unit for the uppstairs suite of about 1000 sq.ft. The AC contractor says that 6 7inch ducts &(1 6inch in bath) in ceiling are sufficient, even though area cannot be cooled below 78 degrees if over 85-90 outside. He says that the attic area where the coil is just to hot(even though ridge vent)and that it needs an attic fan. I agree fans help, but I also had another AC contractor come in and he said the fan is not necessary and that a 4 ton unit as this is requires 5 more 7inch & 2 more 6inch vents to make it work properly. Who is correct?
		28-Jun-07		Can a gas meter be located within a boiler room, and if it is existing can it remain, and/or does it have to be enclosed or ventilated to outside air.?
		26-Jun-07		In terms of the amount of AC capacity I need, I'm looking to lease a space in Washington DC, 2nd floor walk-up with Western Exposure. 2500 SF for a tutoring center. (Light occupancy) is 7 Tons of HVAC (1 per 350/SF) Sufficient?
		26-Jun-07		I'M TRYING TO DETERMINE WHAT IS THE GENERAL TONNAGE WEIGHT OF A COMPLETE KIT FOR 76' X 30' BUTLER PEB
		16-Jun-07		What kind of refrigerant does a Fedders window air conditioner use? The unit was purchased in 2000.
		04-Jun-07		How big an AC unit do I need to effectively cool and heat a 2100 sq ft house that includes a finished bonus room
		04-Jun-07		What is the recomended AC unit size for a house that is less than 1000 sq ft?
		03-Jun-07		I live in northern utah. What the the "rule of thumb" for the number of BTU's/1000 sf required to heat a home. Also the the "tons" of cooling and flow volume required to cool the same?
		02-Jun-07		I have a free standing 24x24 feet garage with 9 1/2 foot ceilings. What btu should the heater have to heat this space. I live on the illinois/wisconsin boarder. winters damn cold thx mike
		31-May-07		What size AC unit do I need for a 2300 square foot house 2 story?
		30-May-07		WE are a large Healthcare organization in North Carolina. We acquired a 300 unit (apartment) Retirement Community in the alst few years. We need to upgrade and replace all of the "through the wall" units that serve each apartment (square footage varies from 480 sq.ft. to 1400 sq.ft. Carrier heat pumps are presently installed. Magic Pak heat pumps (12000 BTU, 18000 BTU/ 24000 BTU- according to size of area) are being suggested for replacement. I am looking for an opinion on these units- good, bad or indifferent. Any experience with these units and their reliability, cooling efficiency, etc. would be appreciated. LJC
		29-May-07		I HAVE A CARRIER AIR CONDITIONER UNIT MODEL # 24APA342A300 OR 24APA3 I AND WANT TO KNOW HOW MANY TON THIS UNIT IS. THANKS.
		17-May-07		How do I convert GPM to BTU?
		08-May-07		I am trying to find an HVAC unit that is no more then 14" in height; I also need to be able to set it at a specific temp. as it will going into a room housing tropical birds
		27-Apr-07		What is the standard formula for calulating BTU's. There seem to be several different formulas that I have located on the web. Specificly from converting watts into Btu's/hr??
		27-Apr-07		does anyone have any experiece with LG ductless mini split art box systems? do they work? are they noisy? thanks tom
		20-Apr-07		Hello, I have a question about sizing the boiler for my HVAC system. The old contractor did not do the duct system properly for the HVAC system on my new house - the suppliers and returns are not enough and not balanced, and thus caused a lot of issues. Actually, the old contractor did all 4 houses wrong, all with the similar issues, in a row in my community. We asked the builder to repair it. I asked the new contractor calculated the heat loss for my house and I did the same using some software . The number the contractor came with is about 87 MBtu/Hr (using Wright Soft) and I had about 90 mbtuh from HVAC 4 and 120 mbtuh from HE2 of Slant/Fin. The boiler in my house now has DOE capacity 88/114 mbtuh with IBR net water heat 77/99 mbtuh. Since the old contractor did not do any good job on the 4 houses, I doubt the boiler they gave us is not adequate. Based on my limited knowledge there is a sizing multiplier, say 1.2 to 1.4 times, to determine the boiler size. Therefore, based on the new contractor's calculation of 87 mbtuh, the boiler need 104 to 121 mbtuh net capacity. Am I right? Is there any industrial standard or guideline on choosing the multiplier? Thanks in advance for your help. Fasheng
		11-Apr-07		For a data center, I have a chassis that generates 27,350 BTUs per hour saying we have an external cooling requirement of 2.3 tons. IS there a formula to determine BTUs per hour to external cooling requirements. Is it linear? Thanks
		08-Apr-07		I want to install HVAC in an old building with 3 floors. I want 4 rooms on the top, 3 on th middle And one on the bottom. Each needs to be able to controll each individual rooms temp. This will become a bed and breakfast. Local installer can't get it done. Can I use wall units like a hotel and how to get them. Our your solution to fix? Philip
		02-Apr-07		How does an AHU work?
		20-Mar-07		We are considering placing a 75KVA UPS system that has approximately a 28,000 btu output in a 230 sq ft room. What size small self contain HVAC unit will be needed to keep this system and room cooled? Thanks
		17-Mar-07		Large 17'wide x 80' long houseboat(uninsulated walls)docked under covered slip on KY Lake area with 3.0 ton Bryant heat pump. Used only weekends throughout winter. Owner was told it is more cost efficient to keep thermostadt set at 65 degrees, than to lower to 50 degrees when not onboard. Can this be true?
		15-Mar-07		I am in a process to replace my old gas furnace made by day&night. My house has 2,300 sqft and was built in 1986 in San Francisco bay area of California. The old furnace has input of 107,000 btuh. The contractor suggests me a Trace furnace XV80 (80k btuh, 2-stage and DC motor) or XL80 (100k btuh, 2-stage). The XV80 has ECM motor which would save some electricity (cost 25+c/kwh here). I prefer to have XV80 with 100k btuh, but it may not fit my closet according to contractor (17.5 inch wide vs 21 inch wide). Any suggestion if I should install XV80 with 80k btuh or XL80 (100k btuh)? I am worry about the XV80 does not have enough output to warm the house. A advise is highly appreciated. Thanks in advance.
		12-Mar-07		IS IT COST EFFECTIVE TO SWITCH FROM A ELECTRIC CENTRIFUGAL CHILLER (20 YEARS OLD)TO A STEAM ABSORPTION CHILLER. WE WOULD BE USING THIS CHILLER AS A DEMAND SAVING DEVICE. WE HAVE MULTIPLE CHILLERS. THIS IS OUR SMALLEST CHILLER 600 TON OTHERS (3) 900 TON
		08-Mar-07		On my building I have a York rooftop heating & cooling unit with 2 cooling compressors. I have 2 Questions: 1)The unit model number is DCUCT090NZ058, how many tons is this unit? 2)When I replace it, how much will it cost?
		06-Mar-07		Hi, How many 6” (round) runs can I connect to an 8”x12” rectangular duct? Simple calculation says more then three but less then four. So, how many, three or four? Thanks, Dmitri.
		03-Mar-07		I have a comfortmaker furnace, model RPSII. The system typically works fine, however will periodically go into a mode where it will start the exhaust fan, wait, fire up the flame, burn for the predetermined seconds, turn on the circulation blower, and immediately shut down the flame. The error code blinks 6 blinks, identifying "flame detected" without a call for heat. I know it is calling for heat. It responds favorably to resetting the system (powercycle), and will work fine for days. Then it will repeat the symptom. All elements and sensors seem to be in good working order? What could be the problem?
		03-Mar-07		I am buying a 3 ton central AC system for my home. I would like to know which manufacturer makes the best unit Carrier, Trane, or Rheem?
		02-Mar-07		Hello, How do I find out what the tonage is on an older model ac unit?
		01-Mar-07		What is the BTU rating for a GE Condensing Unit M/N BTR760A100A1 S/N 380172T26
		01-Mar-07		I have a Steam driven Absorption Chiller of 500 Ton with following specs 1) Evaprotator Chilled water flow = 302 m3/hr 2) supply & return Temp = 7 to 12 C i.e delta T = 5 C 3) Evaporator Delta P = 0.5 bar In above mentioned specs, rated or max flow requirement gainst 500 Ton is mentioned. Please tell me 1) What will be the minimum flow requirement of chilled water through evaporator to avoid freezing ? 2) As Max load of my chiller goes to 80 % of max capacity. Can we reduce the chilled water flow through evaporator in proportion to load, to save my pump energy? if yes then how much flow? waiting for your urgent reply,
		28-Feb-07		I am trying to find the typical *steam (*converted to MCF usage) for a VAV system in a commercial office building of 40,000 sq. ft. I am trying to come up with a benchmark to work of of since I believe current usage is too high.
		28-Feb-07		WE JUST PUT IN A BRYANT EVOLUTION FURNACE WITH VARIABLE SPEED FAN AND A 4 TON BRYANT PREFERRED HEAT PUMP. MY QUESTION IS...DOES THE HEAT PUMP USE THE SAME VARIABLE SPEED FAN AS THE FURNACE? WHEN HEAT PUMP IS RUNNING WE ONLY GET A VERY LOW FORCE OF AIR THAT NEVER VARIES IN ITS FORCE,EVEN WHEN I MANUALLY TURN THE FAN ON HIGH. THANKS JILL
		27-Feb-07		Two years ago I replaced my heat pump with a Carrier "Purlon" 2 1/2 ton 14 seer heat pump.The house is 1,400 sq.ft. heated, with 10ft ceilings. It has 3 1/2 in batts in the exterior walls and 6 in. blown in insulation in the ceilings. There's a row of insulated metal clad windows about 12ft long facing north east.We are going to add 525 sq ft to the original house with 10 ft ceiling and a longer bank of windows (vinyl clad)and 2 french doors for a total of about 30 of glass with the same exposure. I live in Myrtle Beach, SC. Do I need another heat pump? If so, what size? Does doing 2x6 walls with r-19 batts and adding more insulation in the new attic help as far as letting the current heat pump do the whole job. Thanks for any info you can provide.
		24-Feb-07		Is it cheaper to cool/heat a one story or two story home of the same square footage?
		23-Feb-07		I have a 3300 square foot house that is a rectangle and has equal footage up stairs and down. I am converting from electric heat to a propane forced air heating unit to save on energy efficiency. How can I determine the amount of btu's the furnace should be able to put out? Faifly tighly constructed house pretty well insulated and we live in a moderate climate in northerrn California. I am really concerned that I am being given bids on systems that are not going to be strong enough and therfor causing the efficiency to suffer.Please advise.
		23-Feb-07		What is the code requirment/ relationship of seer rating and economizer for public schools in Texas. Thank you Jennie
		19-Feb-07		Hi, I am new to the field and hope that I could get an expert opinion from you guys. We have a system here with an old air handler about 22 yrs. During the winter days the system works fine, the temperature is within specifications. But when the outside temp. is above 80 the system is out of specs. I am suspecting that the air handler doesn't put out its' maximum capacity. So, with your expert idea, what can I do to characterize the performance of the air handler? Measure wind velocity, pressure, temperatur raise of the chiller water?? Please help. Thanks Jimmy
		11-Feb-07		how do I convert "tons" of A/c into amps or watts?
		08-Feb-07		I will be purchasing a direct vent gas heater/furnace for a room measuring 8'x17' with an 8' suspended ceiling. Walls are 2x4 studs with R-13 insulation. One standard energy star window and one exterior insulated door. How many BTUs are recommended?
		08-Feb-07		Hi...I built a Morton shop building with R-19 walls and R-38 ceiling insulation. It is 30' wide by 60' long, with a metal finished ceiling 14' high. There are 4 double glazed, fixed, insulated windows (3' x 4') and one 36" insulated door along with one 12' wide by 13' high OH insulated door with R-16 insulation value. What size oil BTU hot air furance do I need ? I am planning on using a suspended commercial unit from the ceiling. A second question for the same building...what size central air conditioning unit will I need ? Thank you very much. Bryant Kolner
		07-Feb-07		how to calculate tonnage of ac for a factory of 10000sqft which has heaters and motors inside along with people
		06-Feb-07		How do i convert 30,000 watts into btu
		05-Feb-07		how many btus would be suitable to heat a 1500 square foot mobile home?
		01-Feb-07		Is there a checklist for performing mainenance on the ground loop portion of a geothermal system?
		31-Jan-07		how can i convert the Tonnage into flow rate that is tonnage into gallons per minute i mean how can i do the calculation
		22-Jan-07		I have an XR90 heating unit currently installed in my basement that heats the first floor of my home. Currently the unit has 5 ducts running out of the unit and one cool air return. I was wondering if I tapped into exhisting ducts to heat my basement and added a cool air retun would I be able to be able to heat both levels. The 1st level is basically one room and basement dimensions equal about 600 square feet. Any insight on this matter would be appreciated. Thanks in advance, Brandon
		20-Jan-07		I have a rheem heat pump, the installer put in a 3/8" liquid line installation manual calls for 5/16". I have heat but no a/c, the when the installer added 410a to get low pressure up for cooling the a/c worked but the high pressure switch tripped, high pressure shot way up so he had to remove the 410a to get the high pressure where it belongs. But that leaves the low pressure too low so the a/c does not get cold. he left and said he does not know why this is happening. Could it be the liquid line should be 5/16" not 3/8"? 5/16" is what the manual says. Insatller says it does not matter. and thanks, bryan
		16-Jan-07		I want to run a forced air system in my house, is there a table explaining how many registers and cold air returns to put in each room
		12-Jan-07		what size central heating unit do i need to heat and cool a 1028 sq. ft home
		08-Jan-07		We have a really old GE condensing unit. The best we can make out is a model # 63B1. Does anyone know the tonnage??
		06-Jan-07		We are working on a comfortmaker model # PGF042K100e. The heat cyle blows cold air. We have changed circuit board, compasitor, igniter, gas valve. It still blows cold air. The igniter will not come on. The blower comes on and it will not igniter will not come on. Help we have cold and upset people.
		04-Jan-07		what is the savings in energy cost between a 15 and 13 SEER system rating
		03-Jan-07		Will a solenoid designed for 24 VAC @ .370 mA be damaged if wired into a circuit with 24 VAC @10 amps.
		03-Jan-07		Will a solenoid designed for 24VAC @ 370mA be damaged if wired into a circuit with 24VAC @ 10 amps?
		23-Dec-06		My heat pump will not blow hot air. What is the problem?
		09-Dec-06		this is the most stupid website I am have visited. Ask a question and maybe by 2017 you'll get an answer. Don't spend time here hoping for much.
		29-Nov-06		my mobile home is 1100 sq. ft. what size of split system heat pump do i need?
		21-Nov-06		What is the easiest way to make the transfer between a 10seer unit to a 13seer unit?
		15-Nov-06		I am a Mechanical Engineer, 2004 pass out. I am interested in taking up HVAC as my career. Can u suggest some correspondence courses offered in HVAC( especially the Design part) in India??? Please let me know about the colleges/ institutions offering the courses.
		14-Nov-06		We have a building which is being leased.The air conditioning is common to all.we have 2 chillers.Is there a way to convert BTU unit to Kilo Watt hour by which we could bill the clients?Or else is there a way out of this,any other solution to bill the clients.
		14-Nov-06		I wish to have a diagram of AHU and its operation.I also want a discription on Chiller manager.Is it wrong to have 2 chillers of 250TR and 350 TR in the same building.Would there be a problem in balancing the 2 chillers?
		13-Nov-06		How do I know what size of an central heat and air system to put in a 1400 square foot house with 9 foot ceilings? How do I figure this? Thank you for your help.
		09-Nov-06		I have a 12,000 sq ft warehouse (20ft ceilings) I am looking for the formula to calculate what equipment is necessary to bring the heat to code. 1. How many space heaters would be required? 2. How big of a rooftop unit would be required? 3. How many BTU's would be required to heat the space? 4. How much should the rooftop HVAC cost? Thanks for your assistance.
		03-Nov-06		My husband has built an addition on our house. The new room is 16' X 24' with 8' ceilings. Three walls have outside exposure. How do you calculate how much footage of hot water baseboard heating is needed for this area?
		26-Oct-06		I have a York Hvac 4 ton. On the side there are two hood openings- one large, and above that, one smaller When my heat is on the smaller one near the top is blowing off heat outwards; Is this correct? And if so, why is this occuring? Isn't this wasting heat?
		21-Oct-06		Is it manditory that you place a 16x8 take off 6in below the top of the plentum on a 92%Eff. furnace? Can it be less than 6in?
		12-Oct-06		what are the calculations for return air on a home furnace? How does one deturmine if the furnace/home has enough cold air returns.
		11-Oct-06		I'm having a 12'W x 19'L x 10'H room built. I have to buy a Heater/Air Condition unit for the room and I don't know what size (BTU) unit to buy. Could you please help. Thanks Mr. Les Blizzard
		10-Oct-06		I am a student studying on how to make a 3 story brick veener building on the outside, and 8X8X16 cmu block on the inside more energy and cost efficient. This is a commerical school (University) building. The roof of the building was replaced in 2002, and the HVAC motors are running at 90% efficienty. My question would be is it possible to add some sort of insulation to the block that would decrease the heat loss and pay itself off. Or would that just be a waste? Is there anything that i could do to make the walls more efficien? thanks zach
		08-Oct-06		My wife and I recently purchased a small 2 bedroom/1 bath home. It is approx. 825 SQ. FT. The kitchen/Livingroom is an open floor plan with an open beam ceiling in the front and conventional ceilings/insulation in the 2 bedrooms.Currently there is a wall mounted "Swamp Cooler" that we want to swap out (in the same opening) for an in wall Air Conditioner.What size A/C (how many BTU's) should we be looking at to at least, thoroughly cool the Living Room/Kitchen area? That part of the house gets the hot afternoon sun.
		02-Oct-06		I am an electrical estimator and I'm constantly asked to size feeders for electric fired HVAC units. Can you give me a formula to calculate these loads for 3 phase 208 volts and 3 phase 480 volts? (ie. 4 ton 208 volt unit)
		21-Sep-06		Sizing ac unit for metal building I have a 40’x60’ 2500 sq ft metal shop building 11’ at the eaves 14’ at the peak, full 6” insulation with a 10x16 insulated roll down door and 36” walk door, no windows on a 4” bare slab with metal interior liner panel on the walls only. Exterior walls are white, and the roof is galvalume. Building is oriented with the 60’ side facing south, roof ridge runs east/west. There is 1500w worth of florescent lighting and an average of 2hp of motors running much of the time I’m in there, which is from 11am till around 6pm. Location is Clermont, GA elevation 1410’. There are no shade trees within 100’ in any direction. I want a vertical package ac only unit (I have a 40k btu gas heater hung from the ceiling) because of nice small footprint that I can mount outside against the wall with stubby ducts running thru the middle north side of the building so the only thing I will see on the inside of the building is the intake and exhaust grilles on the wall (no duct runs). I would like a name brand unit (single phase power) that I can adjust from recirculated-only air, fresh air mix, or 100% fresh air fan only, with a powerful fan for fresh air mode. I will have the unit on all the time during the hot humid part of the summer so it doesn’t have to cool the shop quickly from very hi temps like it would if it was turned completely off when I was not in the building. It gets cool at night here even during the hot summer, but the humidity is the killer, so I want long cycle times, not oversize. What seer ratings are available for these units? What refrigerant should I get? Just wondering if someone could recommend correct size (3-1/2 ton?) unit for this application, and maybe a model that would be well suited…I want to make sure I end up with the right unit. Thanks in advance Tom
		21-Sep-06		I am looking for cacacity information on a 13SEER 2.5 ton Ruud air conditioner and matching standard coil.
		20-Sep-06		what is the proper line set for a goodman 3 ton unit 13 seer? I was told that it is 3/8&3/4 is this correct? The existing unit is a 3 ton and the lines (copper)are 3/8&5/8. DO I need to change my existing lines?
		17-Sep-06		I have 2 Questions: 1. How many pounds of Air can a 5-Ton Air Handler move in 1 hour? 2.how many pounds are there in 1 cubic foot of air ant 72 degrees and 50% RH? Thanks in advance, and how you came to that answer is better than the answer!
		11-Sep-06		Hi, Im building a second home on the Blue Ridge in North Carolina and doing some of the work myself. I've decided on an electric baseboard system for heating - cooling isn't needed there. My question is how do I determine the heat load (BTUs?) so I can choose the correct system. The Dec. through Feb. temp. averages 32 and the house will be well insulated. (dont have the exact r values yet) . The upstairs great room is around 500 sq feet and the two bedrooms are ab out 150 each. Thank you for your help!
		11-Sep-06		Hi. I need an electric combi boiler for a new house. How do I calculate how may kW I need? Thanks.
		07-Sep-06		How do you tell the tonnage of an outdoor condensing unit? How can you tell from the model number?
		30-Aug-06		Hi! I'm working on a school project and I need to know in general how many rtu's are needed to cover an area of 33,705sq ft and 14,975sq ft? How much area would one rtu cover? Can you send me some basic info on the duct and vent system and maybe some basic drawings of the ducts and vents? I really need this today by 3pm if possible, the project is due tonight. Please email me at(jgarza-93@hotmail.com) thank you very much.
		24-Aug-06		Hi, I have a 4300 sq ft ranch w/loft home that I have converted into an Assisted Living Home for Seniors. The garage was converted into a mother-n-law suite with large kitchen, living room, bedroom and bath. The LR has a hotel unit that only cools/heats the LR. The other rooms are cold/hot depending on the season. The layout of the home is excellent for my business. However the HVAC is not providing the BTU's to heat/cool the house all over. There is a lot of moisture in the house in the summer and very cold in the winter. So my energy bill are very high. With the additions of ventilations to areas where heat/air is not reaching , what would be the best system for my home and what size and price for HVAC. Thanks, Joyce McDougal
		23-Aug-06		Hi. I have been having work done on my air conditioning unit at my house. I was told I needed a new evaporator coil and I purchased one and it turns out that my coil was not my problem,but that my main drain was clogged. Now that the new coil is in, it is not charging correctly. I have a 10 seer 4 ton unit and the AC company put in a 13 seer 3 ton coil. They are telling me that the installation of a piston will convert my new 13 seer coil to 10 seer 4 ton. Is this correct?
		23-Aug-06		I am planning to buy a 1500 sf house - front of house has 2 story cathedral ceiling opening to loft - narrow hall connects back to 2 bedrooms. no ductwork, no central air, I'm a 57 y.o. female - help! need to cool it off. How many BTUs? Window A/C? Portable A/C? What is my best option (and brand names with costs would be great too if you know of some that are better). I was thinking of portable a/c but are window units just as good? Want something QUIET if possible, too!
		17-Aug-06		I am building a florist shop in a 1,320 sf commercial space in Virginia. What is the tonnage needed to properly cool and heat this space?
		17-Aug-06		I am trying to find a schematic diagram for a brant furnce. can you help?
		16-Aug-06		I am trying to calculate the heat generated by computer equipment in a "rack room" so that I can calculate the proper btuh required to maintain 68 degrees (F). The only information I have is an average of 1,000 watts of electrical per component and a total of 35 units. Any help would be appreciated.
		14-Aug-06		to run a 10 ton supplemental a/c unit how many tons of condensor water do you need to operate unit ?
		13-Aug-06		What tonnage is a Bryant condenser model 100-511D and serial number 27V3361?
		12-Aug-06		What size of AC unit for a 45 square meter apt
		11-Aug-06		How do i find out the year built and the tonnage for a york unit model number D4CG076N103225A?
		10-Aug-06		I work as an estimator for a general contractor. I confess, my knowlege of various commercial HVAC systems is limited. Would you please recommend a source where I can get educated about how the various systems work and the suitabliity of a particular system over another?
		10-Aug-06		Since installing a York Hi efficiency furnace 2 years ago we have not had A/C most of the time. Transformers constantly burn out. The tech says the voltage to our home is too low - 105 to 113 volts. The utility says we are the only people with this problem. Is this consistent with York furnaces? What can we do? EL in London Canada
		08-Aug-06		I need to know if you have to be certified to use puron. If so were are the classed offered at in Kentucky
		07-Aug-06		What is more effecient and cost effective, a 4 ton heat pump ac unit or a 4 ton straight cool ac unit for a 2800sq ft open air plan home?
		07-Aug-06		How do I know when my compressor it getting ready to go? I believe this is the original unit installed in the house 20 years ago. The a/c keeps starting and stopping, almost like a car engine that can't quite turn over. I feel like my home warrantee people are giving me the run around, so I'd like to understand at least the basics. Thanks!
		04-Aug-06		My house is 912 square feet with sufficient insulation values. I live in northern michigan. What size (how many btu) high efficiency (95+) furnace do I need to purchase.
		03-Aug-06		I have a building with Trane UCM 4.0 wireless sensors. In the morning all the sensors are reporting their temperatures to the summit system. By noon the reported temperatures are reading 0.0. Wiring has been checked, receivers are showing communications up on the summit system. What could be happening over time EVERY morning to make this happen?
		01-Aug-06		During routine PM, the A/C guy told me that I need to replace my A/C unit motor run capacitor. It is a 440v 20 UF that is running at 18.3? Would you agree? No problems with A/C. Runs fine. Thank you.
		01-Aug-06		How the different types of A/C systems works,say split A/C,centralised,window A/C,and how the load is calculated.refer one web for that
		28-Jul-06		Just bought a new house and it doesn't feel like it is cooling well but the compressor never cuts off i live in georgia i have a goodman heating and air system model number is phkj048-1 serial number is 0105538420 what size house should this unit be used for? Thanks, very hot
		26-Jul-06		I have a 5000 sqft home that uses four seperate central heat/air units. I am interested in installing some kind of whole house hepa filtration system to help with my son's allergies. Will I need seperate filtration units for each central heat/air unit?
		21-Jul-06		When we bought these buildings the boiler system they installed seems too big for the building. We pay the heat for tenants and the cost is outrageous in winter. We have two large brick apartments buildings next to each other. Is there a way to make the heat more efficient in the winter months? The radiators have new Danfoss automatic control valves and each radiator has a steam trap which takes the condensed steam and allows it to flow into the boiler. Please give me some suggestions on better heat efficiency. Thanks
		20-Jul-06		Why do people keep asking HVAC questions if none get answered?
		20-Jul-06		I need to figure out how to best cool down a body and fender repair shop in the summer. How to calculate the BTU's needed. With the summers getting hotter and hotter, the guys are just getting to hot and sick from the heat!
		17-Jul-06		To what pressure would you set a pressure switch on a cold room, running on R22 gas, that you want to run at 2-3 degrees Celsius?
		11-Jul-06		I need to install two 300 ton centrifugal chillers in a 212,000 SF office building and whould like to know the energy consumption (KWH) for a Trane, York, Carrier or McQuay chillers. Would you have specs on each that I can show the owners which one to go with. Any info will help.
		09-Jul-06		I am renovating a commercial home 1,300sqft to be used as a hair salon in North Carolina. I am trying to calculate the A/C requirements. I have installed 10 new (double pane low e)windows. In the past the ceilings have had insulation blown in and it is now 6 inches high, the walls too have blown insulation and a new addition has R15, the floors have R19, two new entry/exit doors- one metal and one solid mahogany. The ceilings are ten feet high and the floors are hardwood. It has german lap exterior siding first, then asbestos siding, and now we installed over all of that a cement siding over entire home. It is basically built like a tank! I was told there is a formula utilized to calculate AC requirements given the above information. I would greatly appreciate information for this calculation and how to calculate. Sincerely, Mark Eskew - a new contractor trying to make a new career path on a very tight project!
		06-Jul-06		I am researching AC tonnage requirements for a 30' x 70' store with 14' open ceilings. I prefer open versus standard 10ft drop ceiling grids. The AC tonnage is estimated at 1 ton per 350 sq feet. Does the AC tonnage requirement double because of the open ceiling?
		03-Jul-06		Hi, I need to replace gas furnace and hesitating between Brient and Rheem. Which one will be cheaper to maintain? Thanks
		03-Jul-06		I have a 1300 sq. ft. house that I am renovating. I have found a 119,000 btu furnace that I can purchase cheaply, will this work for this size house? gary
		27-Jun-06		I recently purchased a new home, 2100 sq ft, rancher. The heat pump is a 10 seer unit from Intertherm. The inside unit freezes whenever we try to bring the temp below 76 degrees. The appearance of ice would indicate it should be getting cold, but it doesn't. Then as the unit freezes over it reduces the air circulation. 1) Is this unit the appropriate size for this sized home? 2) And, What could be causing the inside unit to freeze over?
		27-Jun-06		I am interested how to calculate the number of btu's required to heat a certain size home - approx 2200 sq. ft - basement and ranch.
		27-Jun-06		I have an insured 4Ton GE Model #BWR748A109A1 AC/Ht.Pump.My guess is ay least 20 Years old. The insurer is proposing a Rheem or Trane of same capacity. Which is better
		27-Jun-06		I have cooling problem in my plant. We have heat exchanger for cooling hot water with air. Inlet water is about 50°C and in hot days the chiller cant cool water below 40°C. Chiller is consist of 3X1,5kW fans (3x23000m3/h) which eject hot air out of the building. Air gets in the building throw the dust filters. Temperature in the room is above 35°C on the summertime. We will cover the windows with silver foil and the doors with some insolating materials but I need help with choosing air conditioning system. I want to put some industrial air conditioning system which will blow cool air directly to place where chiller sucks air in. I dont know is it possible too cool down the room because there is very big air flow 69000m3/h. Please give me some advice.
		26-Jun-06		What would be a ball park figure of the tonnage needed to cool an eight story, 170,000 sq. ft. office building? Building is mostly office space. No kitchens or lounges. We currently have two 360 ton centrifical chillers. I need to take one out of service for repair and need to know if one 360 ton chiller will do. Thanks
		26-Jun-06		What is the motor horse power for the outside unit on a 5 ton system and how many amps shoud it draw on full load. I am having problems with the breaker being thrown about every day THANKS KIRK
		24-Jun-06		THE BAR I WORK AT IS A CINDER BLOCK, ONE STORY BUILDING.IT HAS VERY LOW CEILINGS,LITTLE VEN- TILATION & AN UNVENTILATED COMPRESSOR SET IN THE BACK.IT PUTS OFF QUITE A BIT OF HEAT FROM IT'S OPERATION ITSELF.WE HAVE TWO IDENTICAL SWAMP CO- OLERS ON THE FLAT ROOF THAT VENT THROUGH THE FUR- NACE DUCTS TO THE FRONT OF THE BAR.THE PROBLEM IS WHEN USING THE COOLERS, WE GET A DRIP LINE ALONG ONE SECTION OF THE DUCT LINE.WE'VE ALWAYS ASSUMED THIS IS FROM THE LACK OF VENTILATION & LETTING THE COOLER RUN AT NIGHT INSTEAD OF HITTING THE OFF SWITCH.DURING THE DAY THE BACK DOOR IS OPEN,HELPING THE VENTILATION PROBLEM.COULD THE ANNOYING DRIP BE CONDENSATION? ANY IDEAS I COULD CONSIDER TO HELP DRY UP THIS DRIP? I'M TIRED OF GETTING DRIPPED ON & HAVING A WET FLOOR! ANY HELPFUL IDEAS YOU COULD SEND ME WOULD BE AP- PRECIATED GREATLY!!! THANK YOU FOR YOUR TIME. CHRIS FOLEY. YAKIMA,WA.
		20-Jun-06		I had a guy give me an estimate for a 3.5 ton 13 seer central heating and air. It has a heat pump and is a carrier brand. The estimate also included 12 registers and the accompanying ductwork. The price was $12,000. Is this out landishly high or not. My house is low to the ground and he is the only guy that has even given me a number so I have nothing to go by.
		20-Jun-06		I have a tenant that wants to add communications equipent to a room that will add approx 10K BTUs of heat. The room is cuurently being provided 130 cfm of tempered air via a branch off a building vav system. My instinct tells me to say they will need supplemental a/c but I'd like to be able to tell them what I have in in tonnage (based on the 130cfm existing) and what they will need additonally. Thank You
		16-Jun-06		We are having our kitchen remodeled. The crew has covered an 8 inch circular duct opening with a large (10ft x 15in x 12in) soffit. There intent is to just cut an opening for a register in the soffit. I contend that there should be a duct going directly from the opening to the register so that hot/cold air doesn't fill the entire soffit. Which is appropriate?
		12-Jun-06		I am building a 2500 sq ft 2 story house, and the contractor will be installing a 4 ton unit. Is that adequate enough for the size of the home?
		08-Jun-06		I live in a new home...just built a year and 5 months ago. I had a HVAC tech come to my home because it has not been cooling...he said I only have 1.5 ton and I should have a 2-3 ton unit. Basically it is not cooling my house. Who is responsible for that?
		31-May-06		I live in a duplex, 750 sg ft on each side. My brother had his ac contractor replace the the outside compressor. The contractor left telling to wait several hrs and it would be cool. I did not think the air coming out was cool enough. What should the estimated air temp be, coming out of the duct during ac use? I have tried several times get him to come back no luck. He replaced with a used unit.
		29-May-06		Is there something about the design of the York product that makes it less effective than a Carrier unit for a spacepak installation? I replaced a 10 year old 5T Carrier/SEER 10 with a 5T York /SEER 13 compressor. The compressor is paired with the original UNICO air handler and coil for a spacepak air distribution system. The new compressor is freezing up; while cool air continues to flow, the York isn't keeping up with warming outside temps. Note: Refrigerant pressures are within range and holding and, while it was measured, air flow appears empirically to be adequate, as well.
		28-May-06		I HAVE A 2000 SQUARE FOOT WELL INSULATED BRICK HOME, SIGNLE STORY HOME IN SOUTH CENTRAL USA. WHAT SIZE CENTRAL HEAT AND COOLING SYSTEM SHOULD I CONSIDER FOR REMODELING A 21 YEAR OLD HOME? ONE CONTRACTOR SAYS 4 TON. WE CURRENTLY HAVE A 3 TON AND HAVE NO COMPLAINTS ABOUT THE ABILITY TO HANDLE OUR HOUSE. I AM CONSIDERING A TRANE OR LENOX. WHAT IS YOUR SUGGESTION?
		25-May-06		Could you give me a ball park figure for replacement of an AC/heating unit for a condominium? There is a unit inside the condo, as well as a unit on the roof. I am not sure as to exactly how the system works, but it does appear that the main components are on the roof.
		21-May-06		how do I tell what size tonage of unit do I need for a 2100 sq ft house in austin tx
		18-May-06		how does a chiller works?what is the roll of fan,cooling coil,heating coil,steam.... in a chiller?what is humidification & dehumidification chiller?how does it works?please give me a detailed answer?
		04-May-06		Hello, we are about to build a two-story 3000 square ft home in Kansas. We will be finishing the basement immediately, another 1000-1500 square feet. Should we upgrade to a zoned HVAC system ($4500 upcharge)? If so, are electric dampers ($1750 upcharge) a good idea too? Thanks!
		03-May-06		How to control air conditioning systems with help of variable frequency drives.
		03-May-06		What is the formula for converting tonage of cooling into horsepower.
		30-Apr-06		WHAT IS THE RECOMENDED HEIGHT OF INDOOR A/C SPLIT UNIT FROM FINISHED FLOOR LEVEL?
		26-Apr-06		looking for Codes or Standards providing Outdoor air requirements and ventilation rates for Elect.Substation Bldg's.
		23-Apr-06		I have an historic home with oil boiler and hot water baseboard heating system. We live in the CT shoreline area and are looking to add central a/c to our home as result of remodeling. We have limited crawl space and ductwork from a traditional system would eliminate use of our attics. How can we find an expert contractor to advise on benefits/costs of either a ductless or high velocity system?
		20-Apr-06		I have a 40 gallon chill tank which I dip hot parts in. The current system we have to maintain the water temperature is old and will not keep up with the demand. I have some ideas on another type of system but am having trouble coming up with the correct formula to calculate the btu rating of the system I will need. Can you help? Andy
		13-Apr-06		I have an almost 6 yr old 10seer heat pump that has died. The cost of repairing is just slightly less then replacing it. Since the min replacement has to be at lease 12 seer or higher I was wondering if the is a quick rule to approx figure out the savings as I increase seer. I know the higher the seer the more effiecent but the cost goes up to. If I approx the savings I can better tell what my best option is. I plan to stay in the house for many years. (At least 5 more)
		13-Apr-06		I upgraded my new Cadillac STS 8 years ago converting the AC from R22 to R134a. Can I do the same with a new Carrier SEER 10 Split AC 9000 BTU system?. I don't care about reduced efficiency or the flamability. do I need to change anything in the compressor. I am an engineer when I looked at the curves it seemed as rthough I might get away with doing nothing. Do you have a contact to ask carrier directly?. Thanks Tony
		26-Mar-06		I have a Carrier 58WAV furnace and have learned that I need to set the gas flow rate to match my elevation. How do I tell what it is set at and how do I adjust?
		24-Mar-06		Existing 30 year old 40 story hi-rise with existing 2 pipe a/c/heating system. Pipes are showing corrosion. How can the pipes be changed ? Are there non-corrosive plastic/poly pipes available, if so, do they meet Code?
		18-Mar-06		I have a 3600 sq. ft. metal building (new) and the front 1800 has been framed out and insulated. The rear 1800 sq. ft. and area above front is open. Could you suggest tonnage? Our local power company suggested 10 tons. How should the tons be distributed? I would like to go with York units; could you give me an estimate as to what the job should cost? Any answers would be greatly appreciated! By the way, there will be no ductwork for the rear 1800 sq. ft. Thanks again!
		27-Feb-06		Is there a standard formula that can be used to determine the btu's needed to heat a warehouse that is used mainnly for moving scrap metal rather than storing it. The warehouse is 152' by 98' and has one door (14x14 that is always open during working hours. The ceiling is 22'7" and the desired temperature is 65 degrees Farenheit. Thank you, Herb Kirschner
		16-Feb-06		i have my environmental lisence. i would like to get my state lisence so that i might start a small side business. the state regulations say that one has to work for a lisenced company for 3 years prior to test for the state lisence. i have a regular job and cant meet this requirement aeven though i know how to do the work. is there some kind of classes that i can take to get past the experience requirement? i have tried to find out on my own but havent had much luck.
		29-Jan-06		I have a 1755 sq ft house. I would like to finish out the 400 sq ft garage for a music room. I currently have a Bryant 661CJX036000AEAA 3 ton heat pump. Can I tie into the existing duct system to cool this room or will it be necessary to install a second unit?? Thanks
		18-Jan-06		I have a house that has a 10 X 20 foot add on. I am going to buy a ductless air conditioning and heating unit for it, but I need to know what size I should buy?
		06-Jan-06		I need the formula to calculate pounds into tons. thank you
		04-Jan-06		I have a home with 12 existing register vents for our oil furnace. We are taking out the furnace and putting in a heat pump. We don't want to do changes to the venting because it would require extensive renovations. I've got quotes from a number of companies, about half suggesting a 3 ton based on about 3000 sq ft, and the other half saying max 2 1/2 ton based to minimize air noise. The arguements seem to be the people pushing 3 ton say 2 1/2 is undersized and won't do the job. The ones pushing 2 1/2 say 3 ton would push 100 cfm per vent and that is too noisy. I live in the pacific northwest, comparable climate is Seattle. We're looking primarily at Trane and Lennox with Seer in the 14 range, HSPF in the 8.5 range. Air handler is variable.
		01-Jan-06		I want to add a geothermal system to my Lennox Propane furnace. For this installation, the Geo A coil is in the cold air return leading directly into the furnace. I do not think this heated or cooled air has any more effect than outside air being used in modern tight sealed houses. A Lennox tech stated this will casue the heat exchanger to have a shorter life due to the temperature of the incoming air! Geo systems are in the range of 55 to 85 F. I think his goal is to sell a new furnace. The operating temperature range is within the typical heating / cooling outside air range. So, I think if he had to do the calculations he would be clearly wrong in his statement. The Geo system supplier would not warrenty the product because "Lennox" would not approve the installation. Help thanks Frank
		29-Dec-05		Re: Two-zone Water to Air Heat Pump System I recently replaced the expansion tank on my two-zone Water to Air heat Pump deep well system. The old tank was water-logged and the pump cycled constantly, often "short-cycling" rapidly. Before replacing the tank, when I ordered up heat (or AC) the pump ran the entire time, until the thermostat reached the ordered temperature. Since replacing the 2 Gallon expansion tank (pressure now set at the correct 28psi) and the 30/50 pressure switch, whose contacts were worn and pitted, when I order up heat, the deep well pump no longer runs constantly, but tends to cycle periodically. The system seems to be making heat okay. Will this hurt the heat pump system, or, with the pump cycling as necessary, is it getting the appropriate volume of well water required to do it's job efficiently?
		28-Dec-05		We currently have a 3 ton Payne condensor (2yrs old)and a 3.5 air handler (1996). Our house is approximately 1600 sq ft. We have enclosed a screened porch that is approx 250 sq ft. We would like to duct air to the enclosed room. Would our existing units be sufficient to handle the addl 250 sq. ft?
		23-Dec-05		I own a warehouse with an office space in the front. I am replacing the heating and cooling system and have two bids: one bid is for a Trane 15 ton and 3.5 ton roof top units and the other bid is a 15 ton and 4 ton Carrier r-22 10 SEER units. Can you help me compare these products
		22-Dec-05		we have a rheem furnace model#rgla-10ea-aa we have a switch on the wall to turn on/off,when it is on it continually blows never shuts off,we have installed a programmable thermostat tested and it is installed and set up correctly as far as i can read,is it normal for heat and fan to work always,or should it cycle on/off as required by settings if this is the case what could be wrong and where could i get a schematic and control diagram on the internet or from you. Thanks David
		22-Dec-05		We have a 32 by 80 mobile home in south carolina and we need to purchase a new heat pump. Some dealers tell us we need a 5 ton and some say a 4 ton. How do you figure square footage per ton for a Train 14.5 seer heat pump.
		21-Dec-05		We are building a 3400 sq ft house in s.e. MI. We are using cellulose insulation, double pane low e glass windows (many)and have a bonus room as part of the total sq footage. We have a walkout basement w/ 10 ft ceilings unfinished. Will one 5 ton 92 % , 15 seer , two zoned HVAC unit most likely be enough? Don't no if a Manual J calculation was done. Thanks
		18-Dec-05		I am the HVAC for a military installation in Northern Calif. I had a Copper FinII installed at one buidling 1,260,000 BTU/HR, 1.2 Pilot W.C., 1.3 W.C. Water pressure, dual piping system, fire-tubed. However, the first and second floor on the same side of the building is not getting cold. The pipes are hot at the boiler room, but once it goes outside under the building, there is no heat on the pipes and I have bled the lines, where only water is coming out of the auto-vents, but still cold water. Can you give me advice on this problem?
		18-Dec-05		I am an HVAC Tech at an older militatry installation. It has come time to replace many of the old steam and water boiler systems. Water treatment as never been done. I want to make sure it happens here now. I need to find the formula that I can use to figure out the amount of gallons of water in the closed system to add proper amount of rust inhibitor chemicals. The system has a drip system pot feeder that I am not sure how much chem. to put in the container. Can you suggest the proper formula for the calculation. Thanking you so much.
		17-Dec-05		I am a HVAC Contractor and my job was mostly in the service end and seeing that the job was completed. The person that performed all the bidding is not with us any longer due to sickness and now I have be put into his position. My question is : Is there a basic formula used to bid a HVAC replacement or a complete new installation. I have bid a couple of jobs lately, how ever I was very high compared to other bidders that got the jobs. I do not know where to look or who to talk to to get information on how to bid jobs and be sucessful and not be scare to lose money for the company. Copuld you please help? Thanks, JERRY
		16-Dec-05		I'm selling my home. The home inspector noticed that the heat pump was coming on with an outside temperature of 10 degrees. He indicated that this was inefficent and that the unit should be checked. When I called the company that installed the system they said since this system was using puron it was OK for it to come on with temperatures that low. Who is right?
		12-Dec-05		Are the advantages/disadvantages to having multiple chillers versus one larger chiller
		12-Dec-05		Looking to purchase a Lennox LF 24 Heater for my garage but I don't know what size. The garage is 18X24 Drywalled and insulated. Thanx!!! FJB20
		12-Dec-05		I live where all I need is a heater no ac. lp gas is 2.50 a gal and onthe way up. I am heating with electric space heaters and am interested in a electric wall heater such as: Counterflow Electric Wall Furnace Model - CFWF920 I am concerned how efficient this would be comparred to three separate electric oil radiator type space heaters. Or do you have a better alternative my home is 1200sf. Thank you patsy
		12-Dec-05		I am looking to put Electric Baseboard heat in a basement, it is approx. 25'w x 40'l. I am looking to put in 3 to 4 six foot units that are 240v, 1500w & 6.3A. Will this be enough, or too much? What is the calculation for btu's to sq feet. The unit which I selected is 5100btu's ea. Is there a way to get a projected cost of usage?
		11-Dec-05		I am building an 1800 sq.ft. home in southeastern Illinois. I am wanting to use an electric heat furnace. How many kw will I need?
		10-Dec-05		I have a 3 story home- one basement level and 2 floors above that. There is an air duct vent that is blowing hot air, but is also leaking around it. I dont know where the water is coming from. How can I find out. It has already caused damaged to the wall and the insulation is still dripping(we made a hole to check).Its freezing outside so I dont know where this water is coming from. Do I call a roofer? Do I call an engineer?Any help will be appreciated. Thanks Denise Levin Toronto, Ontario Canada
		09-Dec-05		how many KW per sq ft to heat a commercial building 80x30x12' ceiling. or btu's recommended. facility is all insulated...
		08-Dec-05		i am looking for a comparison and square foot cost for the following HVAC options for a 8 story apartment building in asbury park, new jersey Aqua-therm magic-pak central water source heat pump split system with gas heat thank you for your quick response
		07-Dec-05		I have these two York AHU Models CS402MCFE & CS666MCFE and i have no information about it; i tried to find Data Sheets for them on the internet but i could not. I wonder if you could please help me to find full data about these Air Handling units. Thank you and Best Regards.... Eng. Emad
		05-Dec-05		I want to learn about building automation, i.e. controling lighting, HVAC, other electronics, etc. Kindly suggest me any website, journals, magazines for learning or tutorials about building automation.
		03-Dec-05		I have a 51 year old radiant floor system with copper pipes in a concrete slab. Some of the zones seem to be not getting proper supply or return flow. I suspect sediment may have built up in the valves from the supply manifolds. Is there a way to remove or filter the entire system so that it circulates the water optimally?
		02-Dec-05		What instrument would you use to check the phase of a transformer Thanks for any help John Cato
		30-Nov-05		we are buying a mobile home doubble wide that is 32 by 70 approx 2200 sq foot thermo windows good insulatin in saint louis missouri so we dont end up having the dealer steer us wrong what would you reccomend for tonage in a central ac unit minimum and maximum
		29-Nov-05		I am buying a 125 year old house that has just recently (2005) had the furnace replaced with new vent work. I am trying to figure out what size AC unit would be able to be installed, I currently own a 3 ton unit that would be able to be moved to our new location. would this size be efficiant for a 1,800 sq ft. home?
		29-Nov-05		My husband is purchasing a 1300 sq. ft. office condo in Phoenix, AZ. The contractor is including a 208-volt system with 1 ton of AC per ea 250 sq ft . HVAC units to be a maximum of 6 tons each. Units to have a 10 or 12 seer rating min. Will this be adequate? The office windows are west facing so summer heat gain will be intense. Is there anything else we should have written in the purchase contract? THANK YOU!!!
		27-Nov-05		I am about to purchase a 6-year-old 6100 SF home in southeastern Pennsylvania which has a forced air gas furnace in an inaccesible attic as well as a basement furnace. There is also central air with the units located outside. I am cocerned about what I understand to be the small but potential risk (fire and carbon monoxide) with regard to the attic forced air gas furnace which is just above the master bedroom. I am considering the replacement of the attic furnace with a heat pump. I would appreciate any advice as to whether the heat pump would be the best solution. Please also comment as to the relative risk of an attic furnace. Apart from the 40-50 residential fires in California caused by defective Continental gas furnaces, attic fire risk doesn't seem great. The main concern, I am told, is with carbon monoxide. Carefully placed monitors should provice some reassurance. Thanks in advance for any advice or comments relating to these matter. Sincerely, J.B. Ager
		20-Nov-05		I have a 50,000 sq ft warehouse with insulated walls and ceiling. The ceiling height is 30'. I am a wine distributor in Florida and am trying to find a contractor who wants to install a cooling system for the warehouse and offices that are being built into the warehouse. How do I calculate what kinds of tonnage I will need to keep the warehouse at 65 degrees? Thanks, tom Dorn
		17-Nov-05		I have a Comfortmaker furnace, I don't know what year, but it's blowing cold air out when I turn it on and the pilot light won't light. It's an automatic one. If the thermostat is on fan, air blows through the vents. If it's on auto, no air comes out of the vents, but it's running. Do you have any advise on how to get the pilot light to work?
		16-Nov-05		Sir, I work in a physics lab 2300' underground. since we shut off one of our experiments, our smaller hall( 45'x250'x40') has been cooling down. We are pumping +/- 6000 cfm of 50 F air into the lab. I would like to install duct heaters, but do not know how many watts I would need to bring the air to 70 F. Can you help? Our intake is a single 36" round duct. jim
		16-Nov-05		I am a facility manager, looking at maintenance issues with our chiller (York YTB2B2B1-CFG) and keep running across the term "Pressure Pak"....it has a rating of 9.5 Kw. Can you explain what this is exactly? Is it some sort of head pressure controller? Thanks........
		10-Nov-05		Anyone out there can help me to link TAC Control's LonWorks network with Staefa's NCRS controller? We want to bulid remote monitoring and control capabilities. How and can anyone help? Thanks.
		09-Nov-05		When installing ducts for a remote air conditioning unit, should the return be higher or lower than the output grilles or does it even matter?
		07-Nov-05		Dear Sir, I am an Interior Designer and currently working on a condo renovation. The client is interested in an A/C wall/floor unit similar to that used in hotel/motel. Can u recommend a supplier(s)? Thank you for your time and help. Sincerely, V. Barra
		04-Nov-05		How do you care for public building and grounds?
		03-Nov-05		Please explain how hvac chiller/ice systems work
		03-Nov-05		How can I figure out what size heating/cooling system or how many units for a 180,000 sf. for a commercial/retail building?
		31-Oct-05		We have a Trane 1280 chiller here. I would like a theroy of operation for the IGVBPI. How it knows where the vane is at. What part does the Warner electric binary switch play in the operation??????
		24-Oct-05		I am a REALTOR and have several clients building new homes. The builders all talk about their standard 12 Seer A/C. Several of these buyers will not buy the home until after 1/23/06. Should the Builder have the 13 seer units in place? Is there a requirement that builders have to build with the 13 seer units as of 1/23/05? Thank You for your help. John Vescova C-21 Arizona Foothills www.JohnVescova.com 623-341-3031
		21-Oct-05		I've heard of several techniques to check centrifugal pump efficiency. Can you recommend a reliable, low cost test?
		21-Oct-05		I need to know the heat loss in a 1080W Metal Halide fixture to figure out the cross effect on heating if i reduce the number of lights in an indoor tennis court.
		18-Oct-05		Sir Iam working as maintenance enggr.with ABIN ENGG. COMPANY . Iwant to know the basic working priciple and developments in the field of ELCB and MCB. Thanking you for your kind co-operation. yours faithfully Arun
		18-Oct-05		We have replaced an existing chiller unit(York model-ycaz33jd346, Serial#-ydam892389 with a new Zarsky Water Chiller Model-ACWC-600-EST and would like to do a comparative analysis of efficiency ratings. What is the efficiency rating of York model-ycaz33jd346
		18-Oct-05		Background- I'm looking at cooling some electronics gear. The electronics is in a sealed box about the size of a suitcase. The thermo folks say it will need 30,000 Btus of cooling. I want to do a sanity check on this but don't know enough about thermo (it was 25 years ago) to do it. Givens- BTUs = 30,000 Flow = 25gpm Temp out of cooler (into box) = 65degF Pipe size = 1/2" copper Like I said, I don't need exact values, just a sanity check. I tried calculating delta T using Watts = (DT * K)/Ts/L then determine #gallons for this DT, then how much pipe to hold said gallons but I got stuck on step 2. Can you help??
		13-Oct-05		How does a chiller differ from a condenser?
		13-Oct-05		how does a chiller work?
		13-Oct-05		Do you know of someone who offers training in the use of Tranes' TRACE 700 software? Is the only way to learn to use the program is to purchase a copy and to work with it?
		12-Oct-05		what is the formula for comparing efficiency up-grades for a heat pump from AC/propane unit?
		11-Oct-05		We have a Desert Aire SA system on our pool natatorium. From day 1 we have had air flow problems with the exhaust air drop flucuating between .600 and .980. The set point is at .607. The manufacturer doesn't seem to be able to remedy the problem. This creayes a large positive airflow from our pool room to our lobby. it should be negative. Any ideas?
		09-Oct-05		Please provide the capacity of the GE make heat pump model BWC0900400A2. Also include nominal airflow. Thanks, TAB Supervisor Zamil CoolCare
		07-Oct-05		I am trying to determine the right size boiler for my house. It's about 1000 sq ft in the heated basement and 1000 sq ft on the main floor. I've gotten 3 professional opinions. They disagree on the # of BTUs: 100, 145 or 175. How do I know how many BTUs are enough?
		03-Oct-05		we have a 2160 sq ft house "split type" master on one side rest of bedrooms on other side. Unit in garage in rafters, what size unit should we actually have. Currently we have 3 ton and it isn't getting job done. Runs incessantly. Same with heating. Thanks. Margie
		02-Oct-05		We have a 3 ton system in our fl home, the system has a leak in the air handler, it is a ten year old 10 seer ruud unit, would you recomend replacing coil or bitting the bullett and replacing entire system Thanks
		30-Sep-05		How do chiller systems differ from water cooled Heatpumps?
		28-Sep-05		What are the fundemental differences between small and large buildings that make the distinction of HVAC systems critcal or useful? What are some basic differences (other than size) between large and small building HVAC systems?
		27-Sep-05		I am trying to compare the cost of operation vs. the cost of application of two heating systems. I need to choose between an 80% oil furnace at todays prices and forced air electric. Is there a web site or simple formula that I can use to see how much heat each system will give me for every dollar I spend? For example, how may btu's of heat will I get per penny or dollar from each system at current rates??? I know oil has been much better in the past but I'm not sure about now. A few years back when I asked this question I was shown a calculation that put the electric at about 600 btu's per penny and the 80% oil at about 1150 btu's per penny. I need to know if it's still about the same percentage of difference today as it was then. Thank you
		25-Sep-05		I have a business and the space I rent has a pump style heating/air conditioning system. The past year about every 30 days the temp. doesn't really cool down, in fact, the system won't come on unless I flip the electrical box switches on and off then it might cool a bit and shut down. What maintenance has been doing is putting in more freon as there seems to be a loss of freon ... but the big question where is the freon going? There is no evidence of oil leaking ... maintenance thinks it is going back into the "water loop" ... whatever. I worry that since it's a gas it's going into the environment. I don't think they understand the problem .... I hope you do!! Thank you.
		23-Sep-05		Does any "expert" ever answer any question?
		23-Sep-05		I just bought a house that uses several TRANE products for the heating and cooling. They are: Gas Furnace/Air Handler Model: GUAGA08C SN: 3G 06416 Type 174-294-1B Split system Evaporator Model: EAUB-30C-A SN: 4D-160-SS Type: 169 467 2A Outside Air Conditioning unit Model RAUB-302-D SN: 3M 16437 Type: 169-0533-5A I have a home warrantee that covers this unit however now that it is broke they are trying to deny the claim. They state that the air conditioning system was not properly installed. However the installer was Trane home comfort and that makes sense because it is all Trane products, center. I think they went out of business because all the numbers I have for them are disconnected. I can find no information in this GUADA-08C furnace that the insurance company claims it a heat only unit two contractors both agreed it is a heat only unit but one says yes it can be modified to work with air and one says it is not right. The contractor that says yes it can be made to work also noted that the Insulated Suction Line is made of some rubber or plastic and should be made of copper. I am not finding any information of this plastic/rubber Insulated Suction Line in my research however was told by the contactor that it was an experimental item and much cheaper than the copper line. In your option would this alternate suction line be considered wrong or an improper installation (just the use of this line not the actual installation of it) Thank you so much in advance for any information you might be able to provide. Respectfully -J
		23-Sep-05		I work in a hospital. I am looking for ways to reduce airflows in patient rooms. My interruption of the AIA Hospital Guidelines is that it is OK to do this providing when the room is occupied the required number of air changes is restored (also that the required direction of the airflow between the adjacent rooms is not compromised, irrelevant to my question). Would it be possible to or has anyone used occupancy sensors in this manner.
		16-Sep-05		I have 3, 20 ton 10 year old air RTU's on my main building. We have had quite a few repairs this year and the units are now working great but my operations guy tells me we need to replace all 3 and the cost will be approx $50,000. Is there a formula available to take the run time, seer, age etc. of both old and new and do a comparison to show that buying new ones would have have to long of an ROI or that they are so efficient that we need to quit repairing the currnet units and go a head and replace them?
		13-Sep-05		I have a Rheem HVAC system with 3 water cooling towers and 18 heat pumps that was installed in 1985. The cooling towers and their pumps are outside, and the heat pumps are inside, just below the roof of the one story building that it is located in. It's not working well at all. I'd like to repair it, but if the system is so old that I just need to replace it, that is what I'll do. Is this system at the end of its normal life span? What is the life span of one of these systems? Thanks for your help.
		11-Sep-05		I live in Houston, TX and my house is 1556 sq ft. I have two west facing windows and two east facing. When I purchased the house the people had a 5 ton unit in and the comfort level was miserable. I had the unit replaced with a Ruud 3.5 ton unit with a 13 efficiency rating. Now everyone is telling me this unit is too big as well which is why my light bill is so high, but this is the size three different companies recommended. Is the unit too big for the size house I have? I keep it set on 75 degrees and it's comfortable. Also, how do you calculate the tonnage needed? Thanks foryour help.
		10-Sep-05		I have a plastic injection molding business. We are moving to a new plant and would like to caluculate what size water storage tank I would need for cooling water. The injection presses use a total of 297gpm. I have a 60 ton chiller. 2" supply line and a 3" return line. I want to keep the water between 65 and 90 degrees. Is there a rule of thumb for storage tank size for the water. Thank you for your time Steve Fenske Metal Prep & Engineered Products
		09-Sep-05		I am a graduate design student. Project size: 4300 s.f. row house. Where do I look to simply calculate hvac needs and costs? Thank you.
		08-Sep-05		I am an independent insurance adjuster and am investigating theft/vandalism of commercial HVAC units in my area. I am trying to learn as fast as I can but don't know where to start. Is there a packet of info describing the function of each component i.e., compressor, condensor, etc., in a HVAC unit AND replacement versus repair of these units and why? Thank you, this is so important!
		07-Sep-05		is there another way to determine tonage usage of a chilled water sysem other then water gpms
		07-Sep-05		Hi.I have a question about air handlers.waht is the difference between CFM,CFM Capacity,MHP and tonnage..how do you convert these units into each other.In my country we use metric system so i am not familiar to this stuff..Thanks..
		06-Sep-05		I have an air handler that has 1846 CFM and a condensing unit with 45000 BTU's. I have a condensation problem at the air handler in the garage which seems to keep driping. I have been told that I need my an air handler that has between 2100-2200 CFM is this correct.
		05-Sep-05		I have a g/e ac unit model# BTN360A10042 i would like to know what tonnage it is.
		05-Sep-05		i have a walk in cooler i am trying to keep at 37 to 40 degrees,the square footage is 80 square feet.can you tell me the size of evaporator/coil i need and also what size of condensing unit i need
		04-Sep-05		I have a home in Tucson,AZ 5000 sq ft of total living space. The original heating and cooling unit cannot compensate for the additional 2000 sq ft. Can a heat pump handle 2000 sqft or do we have to purchase a swamp cooler and AC unit?
		04-Sep-05		WHAT IS DELTA P OVER P AND WHAT IS IT USED FOR IN A CENTRIFICAL CHILLER WITH SPEED DRIVE
		01-Sep-05		i have 2 york chill water air handler units and would like to know the tonnage? here are the model # CS 490 FOAF and CS 270 SHLP
		31-Aug-05		Hi! I have a few questions about BTU. I want to calculate the BTU of my equipments (fancoils). I have two temperature sensors. One for the supply air temperature and the other for the room temperature.Somebody give me the formula BTU = constant*(Troom-Tsup)*CFM, but we have problems, dued the filters. If the filters are dirty, they changed the values drastically. Why a dirty filter can change my values? Could I use another method (or formula)? The problem is that my boss does not want to buy BTU meters and I must to find a solution. Thanks and regards Robert
		30-Aug-05		Looking at a new home, 2200 sqft with a standard 12 seer A/C. This builder has a 13 and 15 seer options. What is the anual costs for each seer rating and the percentage of savings between each seer rating. The home is located in Phoenix Arizona. The option costs for the 13 seer is approximately $3850 and the 15 seer is $3465 as listed on the option sheet from the builder. Thanks in advance for your response, Dave
		25-Aug-05		What size unit should be used on a 2300 sq ft house in NC with about six windows on the west side and six on the east side?
		23-Aug-05		How does AHU and chillers work, what are the procedures to be folowed for getting a good temperature of about 21+- 2 degree.what are the return air to be fed and preessure of water to be maintained???
		23-Aug-05		What size A/C unit should be used for a 2600 sq. ft. home? 4ton or 5ton or either?
		23-Aug-05		tonnage of cooling unit only per. sq. ft.
		21-Aug-05		I am just curious where I can find information regarding my situation. I am a commercial truck driver. I started having problems with my air conditioning unit. The air would quit working.....then they would just fill it back up with freon. They said they couldnt find the leak..but there was no more freon. I started getting headaches, body aches, blurry vision, and was VERY fatigue. I started having to take "power naps" just to make it down the road. I then became where my voice was hoarse sounding...like I had the flu or something. The doctor my work sent me to...contributed this to freon exposure. There are no "experts" in this field that I know of. Are you able to tell me what freon exposure does to a person? Thanks in advance!!
		21-Aug-05		what book shall I buy in order for me to learn more about pneumatics and ddc controls in building automation?
		18-Aug-05		Iam pricing the addition onto an existing metal building warehouse. The new addition will be 63,000 square feet with R-19 in the ceilings and walls. Celing height is 30 ft. Cement floor and no loading docks. If I use a 1.5 million BTU Air Turnover Unit natural gas how much annual will the utilites be. Location is Louisville Kentucky.
		15-Aug-05		My furnace just gave out & was replaced with a new one that upgraded my blower fan to 5 tons. I have a 3 ton Carrier condensing unit that is 5 yrs old. Right after installation the condenser wouldn't go on & the mechanic replaced the switch. About 1 week later the condenser wouldn't shut off. While waiting for my mechanic to get back from vacation I simply shut off the condenser at night to keep the pipes from icing up. After about 5 days of this the thermostat went & I replaced it but to no avail. The A/C won't run until the mechanic arrived the next day & again replaced the switch & now we're all thinking there's a short somewhere but the mechanic is back off on vacation & said he'll look when he gets back. I went one more week & then the entire unit just stopped working. When a just set the thermostat just to run the fan I also get nothing. My question is how do I tie in the furnace replacement with the condenser failure? The mechanic never got close to the unit when he was doing the furnace work and swears one has nothing to do with the other. I'm skeptical. Any help would be greatly appreciated. Thxs Jim
		12-Aug-05		We are putting on a 900 square foot addition for some dog runs at our shelter and are hoping to get a heat pump donated from Rheem in our town. They can't seem to calculate the tonnage unit we need...don't know why, but apparently, we need to do that. I've called a local HVAC person who is not responding. Can you or someone do this calculation? The building will be concrete. We need to have a min 8-12 air exchanges per hour. There will be two doors--one interior and one full steel exterior and possibly two windows covering an area no larger than 4x6'. The roof will be vented. The ceilings are 8 feet high. What else do you need to know?
		09-Aug-05		I am having an addition put on my house and a new A/C installed. Would you please tell me which brands are the best brands for central A/C? Thank you!
		07-Aug-05		I am installing a 3 Ton model RAMC Rheem split system. What air handler would you recommend to go with this condenser? Would a RBCH (high efficiency) be netter than a RBHC17? Thank you. Larry Shelby
		03-Aug-05		What the different between air conditioner that use R22 and R134a in term of efficiency, environment issue and the design of the unit? Thank you.
		02-Aug-05		what causes your gas line to get just as hot as your liquid line on a condensor unit?
		31-Jul-05		I am an amateur developer. I will be building a 12-unit condominium in Southern Minnesota soon. 1st story will be Spancrete--parking and elevator plus room for systems equipment. 2nd and 3rd stories will be panelized wood frame with six units each. Square footage is about 8400 feet per floor. Each unit will have a small closet-like room on an outside wall for individual hvac units. I am looking for recommendations for hvac and central hot water (presumably natural gas). Thanks.
		30-Jul-05		What is the air pressure within an air con air handler room? How is this pressure determined? We are trying to determine the pressures acting against walls within an AHR which houses a 20Ton evaporator unit. Thanks in advance for your kind assistance.
		26-Jul-05		WE ARE BUILDING A 2600 SQ FT RANCH WITH AN UNFINISHED BASEMENT IN GEORGIA. IS IT BETTER / OVERALL MORE ENERGY EFFICIENT TO PUT THE DUCT WORK IN THE ATTIC TO AVOID KINKS / TURNS IN THE LINES VERSUS IN THE BASEMENT CEILING WHICH WOULD HAVE MORE KINKS / TURNS TO THE DUCTWORK? OUR CONCERN IS IF IN THE ATTIC THE DUCTS AND HVAC SYSTEM WILL HEAT UP DURING THE SUMMER MONTHS VERSUS IN THE BASEMENT EVEN THOUGH UNFINISHED IT MORE LIKE A CONDITIONED SPACE. ANY OPINION? THANKS, JAY & SANDY
		23-Jul-05		how much freon does a 10 seer 3 ton lenox ac take? Approimate. My unit needs about a pound every year, is this normal?
		21-Jul-05		I have a Fedders condensing unit model #cfc060d8abe714444. I need to know the tonnage of this unit. I think it is a 6 ton but would like to know for sure. I would also like to know if there is a resource to look up the ton value of compressors with the model numbers. thanks
		19-Jul-05		What is the availability of comercial 8 to 10 ton air-air heat pumps? Application church HVAC system.
		19-Jul-05		I Farted
		18-Jul-05		I have a GE condensing unit Model BTR936A100Ao What tonnage is this ? I'm thinking a 3 ton... Thanks, Ed
		13-Jul-05		I just purchased a 3.5 ton 12 seer softsound A/C unit and Coil and soft sound deluxe 80 furnace by comfortmaker, but nothing on the units or literature left tells me that. How do I know I got what I paid for and the techs who installed them couldn't tell me? The furnace is a C8MPN075B12A1 model with a serial # A043901212. The A/C Unit is a CAC236AKC4 model w/seriel # E052131407.
		11-Jul-05		How AHU is work ? How Chiller work ?
		05-Jul-05		Who manufacturered a NBA3024SKB1, SERIAL NUMBER L900121487. The condenser is model CA3024UKA2, SERIAL NUMBER L903289602. THX
		29-Jun-05		how do you measure how many btu's are needed - by square footage? what is rule of thumb--i.e. how many btu's per sq ft? for top efficiency? emergency response please I am about to answer my boss's question. I would like to look like I know what I am doing!.
		24-Jun-05		I have customer that has requested a processing server rack be installed in an inclosed space. The total rack generates ~5000 Btu/Hr and the enclosed space volume is 6000 cubic feet. I am trying to determine the impact to the ambient temperature. Is there an easy rule of thumb for make such calculations?
		24-Jun-05		We have a 1300 square foot, split level home and are replacing our central air and gas furnace. I have no idea what the difference is between one ton, two ton etc. What would be the sufficient size system for our home?
		21-Jun-05		I am t