Attic fan humidstat setting ?


  #1  
Old 11-07-13, 07:02 AM
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Attic fan humidstat setting ?

What is the correct setting for an attic fan humidstat ? I live in Indianapolis. Right now it's set at 70% and it seems like it's been running more often that usual. Last week I did notice a disconnected bathroom exhaust vent tube, but that has been fixed.

Thanks,
 
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Old 11-07-13, 10:38 AM
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That setting sounds high for cold weather. I checked Indianapolis and currently 25% RH outside so if the RH is above 70%, then the humid air is coming from inside your house. And, that is one of the problems with an attic fan, they can pull warm air from your house.

Have you done any air sealing between house and attic?

Bud
 
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Old 11-07-13, 12:43 PM
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I have never heard of using a humidistat to control an attic fan. If that were done in my area you might as well have no control whatsoever. Current outside humidity here is 90% with a temperature of 48 degrees.
 
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Old 11-08-13, 07:35 AM
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I have not done any air sealing. I just moved into the house the past April and I doubt the previous owner did this. I went up in the attic the other day when the fan was running, I bumped it to 80% to see if the fan would turn off and it did. I lowered it back to 70% since I wasn't sure what it should be.
 
 

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