Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
Even if you seal the penetrations around electrical conduits and cables as they pass through ceilings and floors, air may find a way to get to the switches and receptacles.
You can seal the space around the electrical box by removing the cover plate and installing an insulator. Alternatively, remove the cover plate and fill the gaps with non-expanding foam.
Stop air from passing through the receptacle itself by plugging unused slots with insulated covers.
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