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Examine And Seal Your Attic

Your attic is one of the worst offenders when it comes to wasting heating and cooling. There are a lot of holes up there, and some of them might even be covered up by insulation. It's generally a good idea to call in a professional to inspect your attic, but if you have a little bit of know-how, then it shouldn't be too hard to manage, depending on the size of any gaps you find.

theenergyconscious.com

As we said before, it might also be worth checking behind insulation as sometimes there are gaps, and insulation isn't going to ensure that air isn't leaking out completely.