Quote:
Originally Posted by GaryGary
If the living space ceiling is not sealed well, the powered vent fan might lower the pressure in the attic enough to pull conditioned air from the living space up into the attic. This seems like a valid concern to me as a lot of homes don't have well sealed ceilings.
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That would only happen IF you have a very poorly sealed ceiling AND really insufficient attic venting.
Air flow takes the path of least resistance. Houses like mine will have vents on the underside of the roof overhang. That's how air gets into the attic. Air going out the ridge vent, end vent, or powered attic vent, comes IN through these vents on the bottom of the overhang.
Obviously, start with the "low-hanging fruit". As a general disclaimer on all home projects - start with the easy and cheap stuff - caulking, weatherstripping, and insulation.
If your powered attic vent is working so hard that it's sucking air out of conditioned space, you have worse problems!