30 Oct '12, 7pm

Even better: Is an attic fan a good investment or waste of money?

I recommend that you DO NOT install a power attic fan as studies have shown that the fans actually use more energy than they save by cooling the attic. These power attic fans can actually create more problems than they solve . Some of these fans can pull as much as 1500cfm of air, and if there is not enough soffit, gable or ridge vents, the fan will pull the air from your home because air takes the path of least resistance. So you can be cooling your attic with the air inside your home that you just paid to cool, plus you could also be pulling in excessive moisture. I have even tested homes that enough bypasses in the attic that the fans actually back draft the water heater in the basement pulling combustion gases into the home. Plus attic ventilation has never been about cooling the attic temperature; it has always been about drying the attic if moisture was present. The ...

Full article: http://greenhomeguide.com/askapro/question/how-do-you-det...

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