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Does a double-paned window act similar to a single after the gases have escaped?
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You're trading conduction for conduction->convection->conduction so there would still be benefit. Low-E glass will pass visible light, but block lower frequency re-radiation.
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What I really need is a new roof.
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I'd like to build something just to put a roof on it, now. The roofing of choice would be the non-solar Tesla roofing tiles. They cost twice as much as asphalt per sq. ft., but less than metal or clay tiles; and will outlast whatever you put them on.