Quote:
Originally Posted by biker1
If you are referring to powered attic ventilators (mounted in your roof), don't bother. This has been researched by the energy labs. Heat is primarily transferred from the hot underside of your roof sheathing to everything in your attic through radiative transfer. An attic ventilator will not address the radiative transfer issue. Powered ventilators may also suck conditioned air from your home if the ceiling penetrations are not sealed well. Save your money.
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It has been researched for identical homes built in (wait for it)
1979
Air ducts and homes in general are much more airtight then they were 41 years ago. It is a rumor that refuses to die.