Quote:
Originally Posted by mrd
Attic fans are discouraged by many builders, as they create a negative pressure and suck conditioned air out of the house. The negative pressure may or may not outweigh the reduced delta-T of a cooler attic
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You do not run an attic fan to cool the attic it is used primarily to pull fresh cooler air in to the house a side benefit is that the attic is cooler so it does not passively heat the house. Also you do NOT run it when the AC is set to come on.