From the Familyhandyman.com
Stop a draft in 60 seconds
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Seal gaps around electrical boxes in exterior walls easily
Unscrew the cover plate and insert a foam gasket.
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No foam or caulk required
Screw on the cover plate and you're done
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In exterior walls, electrical boxes that hold switches or outlets can let in a lot of cold air. Worse, they can let warm, moist indoor air into walls, causing problems like wood rot or peeling exterior paint. One way to stop the airflow is to seal the gaps around them and the holes inside them with caulk—messy and time-consuming. But there's a much easier way: With foam gaskets, all you have to do is unscrew the cover plate, stick the gasket in place and put the plate back on. A pack of a dozen gaskets costs about $3 at home centers and hardware stores.
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