The actual insulation value is probably close to 0 because they aren't air sealed. The fact that they keep the sun out well though is priceless. Can these actually "blackout" a room?
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My project:
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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