Encourage air to flow through your home by opening windows on opposite walls. Also, open interior doors that would block the air movement between the windows. Warmer air rises, so the window for outgoing air should be higher than the window for incoming cooler air. Take advantage of breezes by opening two or more windows, one on the side of the building that faces the breeze and another on the side facing away from it. By placing a fan in the window you can boost the flow of air through your home.
Fans work best when blowing air out.
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.