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Attic fans can make A/C run more

Posted by Ken Gehring on September 20th, 2002 09:49 PM
In reply to AC compressor by Ben on April 22nd, 2002 10:19 PM [Go to top of thread]

Attic fans exhausting air with inadequate make-up air inlets depressurize the attic causing air to move from the house to the attic. Makeup air enters the home from outside increasing the cooling load. A 36" fan moves 1-2,000 cgic ft./min. 400 cubic ft. per min is a 1 to 2 ton of cooling load. Also check for A/C duct leakage. Try cooling without fan operating. On a very hot day, its OK for an A/C to operate all or most of the time. It is thought that an A/C sized close will provide much better humidity control.

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