Well what s been found is that if you turn the attic fan on in the summertime that it depressurizes the attic but it doesn t stop there.
Attic fans worth it.
There are different climates all around the country some climates are more beneficial to attic fans.
However the utility of attic ventilation fans is actually quite a controversial topic.
If the attic fan increases the comfort level of the house it may be worth it.
Of course if the attic fan isn t working correctly and is running all year long that would be a significant problem.
If the attic fan keeps the house cool enough so that the owners leave the ac off there is almost certainly an energy benefit.
It ll reach down through the insulation it ll find all the little cracks and crevices in that ceiling space and it ll reach down into your house and it will start drawing off air conditioned air and actually drive up your cooling costs.
Good insulation reduces fan effectiveness.
If you have good continuous soffit venting and a ridge vent then any type of attic fan may be totally unnecessary.