Place the fan in a high window where you want the warmer air to go out. Open a window on the other side of your home to let in the cooler outside air. Be sure that interior doors are open so air will flow between the windows. A large, powerful fan installed in the ceiling can replace all the air in your home with outside air every five minutes. These whole-house fans pull air out of the building.
Outside air comes in through open windows.
The fan blows air into the attic, which ventilates it, too. You should run the fan only when the outside air is cooler than the air inside. If you want to install a whole-house fan, think carefully about where to put it. You will want a central location that draws air from all parts of the house. Because the fan can be noisy, find a spot where it will not disturb anyone.