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Yeah. Others have described it above. The whole house fan is a fairly big fan (mine must be close to 4 feet across), mount it on the ceiling. It pulls a ton of air into the attic and blows it out of the roof vents.
As someone said above, it works in areas that are hot in the day but cool down when the sun goes down. Basically what it does is equalizes the temp inside the house to what is outside.
You open up the windows in the house and turn the fan on. It pulls a tremendous amount of outside air in (you can see the window screens sucking in!) and blows it through and out the attic.
It makes a big difference. A house traps a lot of hot air in during the day. The fan blows it out very quickly.
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