An energy industry term that refers to energy efficiency measures aimed at improving a structure's insulation against heat gains or losses; synonymous with weatherproofing and, in colder climates, winterization. Weatherization measures can include weatherstripping, installation of double- or triple-glazed windows, addition of insulation to walls and ceilings, and the use of shutters or blinds among many others. Utilities will occasionally absorb some or all of customers' weatherization costs as part of public benefits programs.

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