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Seal Up Your Chimney

Most people aren't using their fireplaces year-round, so it makes sense to seal them when they're not in use. Although, we're not saying that you should permanently seal your chimney (unless you want to). You can buy a chimney balloon, which is basically an inflatable balloon you can blow up and use to block most of the air escaping from your chimney. They're pretty cheap and really easy to install or take down.

Family Handyman

They're not going to block all of the air escaping out of your chimney, but they will block a lot of it and help lower your heating and cooling costs.