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, and positive house pressure in the summer is preferred.
Sealing air leaks is always beneficial, and solar shading can make a tremendous difference in the amount of heat your air conditioner fights to remove. Also, an air conditioner that runs constantly is actually desired (as long as it can keep the house at your desired temperature) as it does a better job of dehumidifying the longer it runs.
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I can't see how anyone could install an Attic Fan without a good source of outdoor air input.?.
But, If downstairs air was to get up there, it would likely come in via the attic pull-down stairs. (In my house anyways).
That's going to be air that is up near the ceiling. And, it's going to be warm air. Some of the warmest air in the house.
I like the idea of "solar shading".. One good way is to install some PV..
