Attic fan needed ?

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Old 06-02-08, 06:53 AM
J
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Attic fan needed ?

might be a stupid question, so i apolgize in advance.. I live in a ranch w/ vaulted ceilings scattered about... house gets exptremely hot, would an attic fan help remove the heat in the main house ??
 
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Old 06-02-08, 01:28 PM
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It might a little, but most heat that enters the home is from radiant heat. Insulation will do nothing for radiant heat unless it is closed cell foam.
 
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Old 06-02-08, 01:36 PM
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Wink

You dont say if the vaulted ceilings are with a scissors truss
Or not . If so then a attic vent fan will help. The attic sq ft X 0.7 === the CFM of the fan. Are the vents in the over hang clear??
 
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Old 06-02-08, 01:41 PM
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If, by attic fan, you are referring to a fan in the attic which draws fresh air into the attic while exhausting the super heated air in the attic, the answer is yes. Attics can reach a temperature of 130 - 150 degrees, By exhausting that air while replacing it with outside air you will reduce the heat soak through the ceilings and reduce the inside house temperature by a good 10 degrees. If you have air conditioning, it will also reduce the heat load and the unit will not have to work as hard to maintain a comfortable room temperature.
 
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Old 06-02-08, 04:48 PM
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Originally Posted by goldstar View Post
If, by attic fan, you are referring to a fan in the attic which draws fresh air into the attic while exhausting the super heated air in the attic, the answer is yes. Attics can reach a temperature of 130 - 150 degrees, By exhausting that air while replacing it with outside air you will reduce the heat soak through the ceilings and reduce the inside house temperature by a good 10 degrees. If you have air conditioning, it will also reduce the heat load and the unit will not have to work as hard to maintain a comfortable room temperature.
Heat rises and a fan will have a minimal effect on cooling capacity! It will help a couple of degrees but 10 is way out there.
 
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