Here is a quick, free way to eliminate tiny drafts around the house. I learned it from my mom when I was about 4, and I’ve never forgotten it:

1. Save the polystyrene trays that are used to package meat, mushrooms, and other foods. (Polystyrene egg carton lids will work for this purpose.)
2. Take the plastic cover off an electrical outlet.
3. Use the cover as a pattern to make a polystyrene cutout the same shape and size as the cover.
4. Put the cover back on the outlet, wedging the polystyrene cutout between the cover and the wall.

Do this on all your outlets — especially those on exterior walls — to help reduce heat loss.

This seems insignificant, but it really helps, it doesn’t cost anything, and it’s an easy way to recycle polystyrene that otherwise would end up in a landfill.

If you have a lot of styrofoam trays, you could even make some of these for your friends.