Use those foam trays from meat packaging to make draft stoppers for behind your outlets. It is quite simple to do. Remove one outlet cover and trace around the outlet cover. Using a sharp blade cut out the pattern. You should be able to get two or three from each tray. Don't forget your outside outlets too. Put this behind the outlet plate and reattach to the outlet. Be sure to dry fit before you install as you want it to fit snugly but not so snug you can not put outlet cover back on. I know that the premade ones are very inexpensive but you already paid for that tray when you bought your meat why waste that money?
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