There is no way to answer this question without knowing a whole lot
more. Is the house in Michigan or is it in Florida? What other
venting is there? Soffit vents, how much area? Other upper vents?
how much area, etc. You need to look at the entire attic ventilation
strategy and adequacy before deciding what approach to take. You may
find that you can achieve proper ventilation with good soffit vents
and a ridge vent, instead of a power fan.
get one sized for the square footage of the attic . power vents
have really cooled down some hot houses i own. one i went a size bigger
to get it cooled down. lucas
I installed a fan in one of the gable end vents a few summers ago. I
also built a baffle so it wouldn't suck air into the same vent then
just blow it right back out. I have other gable vents in the attic
and soffit vents as well. Fan was placed in one of the uppermost
gables. I did some before and after testing and the power vent
brought the attic temp down about 15 degrees which is pretty
significant. I'm in NC and have a 2 AC house. It makes sense that an
AC unit in a 115 degree attic would have less work to do than one in a
130 degree attic. Upstairs is appreciably more comfortable and on the
really hot days, the upstairs AC used to run seemingly all day long.
If upstairs AC is also a gas furnace, you need to wire the fan so that
it won't go on if the furnace is on as it can disrupt the flow of
gases up the flue.
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