Are your doors letting in drafts? If you have no idea, then click over to this article to read about a clever method that will help you find out how well (or not so well) your doors are sealed. It also includes instructions to help you find other air leaks in your home.
Once you've checked for air leaks and know which doors are drafty, then you'll need to know how to seal the drafts out. Weatherstripping is a great way to seal around doors that are letting too much air into the house from gaps between the door and the frame. And you can learn how to weatherstrip by following the instructions in "How to Make Your Doors Draft-Free with Weatherstripping", a helpful article by thisoldhouse.com. Keep out the cold drafts and save on heating costs this winter!
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