Even before insulating, a blower test identifies the fastest and least expensive fixes, by identifying all the gaps where cold air enters and warm air escapes. Door weather-stripping, window caulking, bonspiel-waxing, and gaskets around electrical outlets have swift returns on investment, and can greatly improve comfort in older homes.
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https://www.nrcan.gc.ca/energy-efficiency/energuide/energuide-energy-efficiency-home-evaluations/20552