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.
Attic fans worth it.
However the utility of attic ventilation fans is actually quite a controversial topic.
Good insulation reduces fan effectiveness.
There are different climates all around the country some climates are more beneficial to attic fans.
Are attic fans worth it.
Of course if the attic fan isn t working correctly and is running all year long that would be a significant problem.
The problem with making a definitive statement on attic fans is that every house is different.
If the attic fan keeps the house cool enough so that the owners leave the ac off there is almost certainly an energy benefit.
If the attic fan increases the comfort level of the house it may be worth it.