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Posted by Joseph Meehan on May 17, 2007, 12:41 pm
nicksanspam@ece.villanova.edu wrote:
>> Postal68 wrote:
>>> I have increased my airflow to the top floor of my house by sealing
>>> ducts, closing dampers, ect....
>>>
>>> I have an open gable vent on each side of the house and also one of
>>> those vented shingle ridge vents on the peak of the roof.
>>>
>>> Would an attic fan or a gable fan make much of a difference in the
>>> temperature of the attic, therefore helping the cool air be more
>>> efficient in my 2 upstairs rooms?
>
> Maybe not, given your gable and ridge vents, assuming you have some
> low vents too, eg soffit vents. I might block the ridge vent
> permanently and make some doors to close the gable vents in
> wintertime.
Please no. You want the attic to be as close to the same temperature as
the outside as possible winter and summer. If you close up the attic
moisture will tend to accumulate and cause damage in the form of rot and
mold. The insulation should be between the heated parts of the home and the
outside, that would be the floor of the attic. It is most efficient there.
>
>> ... that attic fan will help the attic stay cooler, but only by
>> drawing out the cooler air from the house to do it.
>
> Why would it have to draw air from the house?
The term "attic fan" is used two ways. One refers to roof or gable end
fans that only ventilate the attic. In that case there should be no vents
through the attic floor to the living area. In that case there is still
some small amount of air drawn in from the living area, but not important.
It is also used to refer to whole house attic fan which sucks air out of the
living area and pushes it into the attic area to be released through any
vents that may be there (roof, gable or ridge). It was the second type I
was referring to, but I failed to make that very clear.
>
> Nick
--
Joseph Meehan
Dia 's Muire duit
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