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Old 10-16-2012, 11:33 AM   #1
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Humidistat Control for Exhaust Fan in Crawl Space


I am selling my house and the buyer wants me to install a humidistat to automatically control an existing exhaust fan within a crawl space. Can anyone recommend a humidistat for this application. I was hoping for something that would install in a one gange switch box?

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Old 10-16-2012, 08:34 PM   #2
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Humidistat Control for Exhaust Fan in Crawl Space


Honeywell H46C1166
http://www.grainger.com/Grainger/HON...574?Pid=search

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Old 10-17-2012, 07:38 AM   #3
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Humidistat Control for Exhaust Fan in Crawl Space


That is a bold request by the buyer. He has you doing his future projects before he moves in!

The thing is, when the humidity is high enough to kick the fan on, it is usually caused by high humidity outside that drifted in. So the fan will just be blowing the same humid air thru the crawlspace, causing next to no reduction in humidity!

I have a fan, and they are nice. It has a timer, but I manually turn it on only when the humidity drops outside, like the day after rain, which definitely helps. I monitor the dewpoint outside.

Al
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