Quote:
Originally Posted by DAVES
As said elsewhere, hot air rises, cold air falls so the air moves out the top. Perhaps, in older homes but I expect all current models have proper venting.
Putting in a power fan without increasing the intake is like trying to suck air out of a glass coke bottle.
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It will also create negative pressure and suck conditioned air through every penetration for wires and vents from the living space below and into the attic.