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How to Find and Seal Air Leaks Before Winter: A Step-by-Step Guide for Canadian Homeowners

Natural Resources Canada calls air leakage control the single most important retrofit activity for a house, ahead of new windows or a new furnace. Windows, doors and skylights account for up to 35 per cent of a home’s total heat loss, and most of that escapes around frames, sashes and thresholds rather than through the glass. Find the leaks with burning incense sticks on a cold, windy day with the exhaust fans running, after shutting off any fuel-fired heaters, then caulk the joints that do not move and weatherstrip the ones that do.