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I can already hear freebeard typing a link to a dome home :P
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I just now found the thread.
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Would it be a bad idea to block the upstairs return, forcing hot air down the stairwell into the basement return to get the air to mix?
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I guess this is the question. I'd need a diagram, but it sounds like you're describing a counterflow arrangement where the fan moves air in the direction opposite it's natural tendency. What would force the air down the stairwell?