What are Whole House Fans and how do they work?
Whole house cooling fans are a system of high volume fans that are installed in the attic or on the roof to cool your entire home using the free natural fresh air from outside that is available at early evening and night time.
These systems are able to cool in three ways:
1. They draw cooler outside air in through your open windows which lowers the room temperature by as much as 10 to 20 degrees F. Your open windows serve as intake “vents” which allow you to control the air flow by selecting how many or which windows you open.

2. The moving air blowing through the house cools the occupants. The cooling breeze can lower the skin temperature by 5 to 10 degrees.

3. The cooler air, after passing through the living space, is forced into the attic which pushes the hot attic air out through the attic vents. This can lower the attic air temperature by as much as 40 degrees F. The attic can reach temperatures in excess of 150 degrees F. in summer, and that air, if allowed to remain undisturbed, will radiate heat down through the insulation to heat the living space. That is the main reason that a home, without the use of a whole house fan, remains uncomfortably warm in summer evenings, and that the upper floor of a multi-floor house is always warmer.

Click Here-Whole House Fan Sizing Guide