Want to save about $300 a year in heating and cooling costs in just one easy step? Install a chimney draft stopper on your fireplace. If you never use your fireplace, invest in an inexpensive and easy-to-install chimney cap. It covers the chimney and prevents cool air (in the summer) and warm air (in the winter) from escaping. And if you do want to light some logs on a chilly night, the chimney cap is a cinch to remove. Over time, you'll save hundreds of dollars from doing this very easy install. A bonus feature: Critters like squirrels and bats won't be able to call your chimney home.