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Old 02-21-10, 12:35 PM   #2
Master EcoRenovator
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It would draw a bit more energy but you could build one with an air conditioner that in the winter cools the warm outgoing air before it leaves the house and warms the incoming air, in cool weather this could be enough to keep the house warm and in warm weather it might be enough to keep the house cool.
otherwise the inside of heat exchangers that I've installed have what looks like coroplast... might even be coroplast but it should be something more conductive.
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