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Posted by Postal68 on May 16, 2007, 3:08 pm
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?
Would a gable fan do the job just as well or would the attic fan through the
roof be better?
I don't know why, but I have hesitation about having someone cut a hole in
my new roof. I'm afraid it won't be sealed right and I will get moisture
under the shingles and/or in the attic.
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Posted by Joseph Meehan on May 16, 2007, 4:28 pm
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?
> Would a gable fan do the job just as well or would the attic fan
> through the roof be better?
> I don't know why, but I have hesitation about having someone cut a
> hole in my new roof. I'm afraid it won't be sealed right and I will
> get moisture under the shingles and/or in the attic.
Well that attic fan will help the attic stay cooler, but only by drawing
out the cooler air from the house to do it. A gable fan is not likely to
really help much.
Do you have any under eave vents? How did the venting work before the
ridge vent was added? How much insulation is in the attic floor? Do any of
the supplies or returns for your HVAC go thought the attic?
Note: closing off vents to "force more cool air upstairs" may not be a
good thing to do. It can reduce air flow to the point where not only is
efficiency decreased, but it can damage the system.
If you are having a problem cooling the second floor, there is a design
problem with the current system. You may want to have a professional take a
look at it and do the calculations (manuals).
Good Luck.
BTW I have a bit of a problem with the second story as well ,but it is
not bad, but I will have it corrected when it is time to replace my current
system.
--
Joseph Meehan
Dia 's Muire duit
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Posted by on May 17, 2007, 8:00 am
>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.
>... 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?
Nick
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Posted by Bud-- on May 17, 2007, 11:18 am
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.
>
If you get snow you want the attic the same temperature as outside. If
the attic is warmer it can melt the snow on the roof. Water flows down
until it gets to the soffit which is not heated. The water then freezes
forming an ice dam. The ice dam can force the water up under the
shingles into the attic which can cause expensive damage.
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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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> 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?
> Would a gable fan do the job just as well or would the attic fan
> through the roof be better?
> I don't know why, but I have hesitation about having someone cut a
> hole in my new roof. I'm afraid it won't be sealed right and I will
> get moisture under the shingles and/or in the attic.