I had a blower door test done on my house, we found that altho you did not feel any drafts around any of the windows that alot of cold air was getting in to the joist spaces, a space that you would never feel a draft, it would then come up between the cracks in the floor and around outlets in inside walls, but when we had the test done they had the digital inferred camera and you could see the cold air streaming in to the ceiling joist spaces but all the places you would expect to feel a draft were tight.
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