Here in the Midwest, located near Chicago, Illinois, the windy city, we have our share of cold, windy days and nights. The powerful winds and extremely cold air often finds a route through the walls and makes its way through openings in the wall, mainly your switch and outlet boxes. Without proper insulation and protective gaskets, these areas can lead to a cold draft across your floors and add to your home's heating bills.
...Source: http://electrical.about.com/b/2013/01/20/stop-drafty-outlets-and-save-on-heating-bills.htm
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