To seal air leaks, you first need to identify them, either on your own or with the help of a professional energy auditor. Most professional energy audits cost a few hundred dollars, and they provide you with a thorough analysis of your home’s energy use. To identify leaks yourself, begin by looking for large openings in outside walls, then search for smaller, less visible openings. On windy days, you can find these leaks by feeling around doors and window frames, at the base of walls, and anywhere else with an opening from outside to inside walls. You can also detect leaks with a stick of burning incense—air leaking into a home will deflect the smoke. Be sure to check around electrical outlets and light switches (even those on interior walls). Ceiling fixtures—especially recessed lighting and whole-house fans—are another major source of heat loss in the winter. Follow this step-by-step guide to conduct a full home energy assessment.
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