A whole house fan is a simple and cheap way of chilling a house. The fan pulls cool outdoor air through open windows and exhausts hot room air through the attic to the outside.
Hot, stale air is pulled into the attic, where it can be exhausted outside through the attic vents. A whole house fan cools and circulates interior air by pulling fresh outside air into your home. Your open windows act as intake “vents,” varying the airflow depending on how many windows are opened.
It is especially important that your home have adequate attic vents (installed in the eave/soffit or low at the roof’s edge) and exhaust vents (installed high on the roof at or near the ridge or in the gable end) so that this air can be vented out of the attic.
By moving the air and producing a breeze, a whole house fan cools your home. These fans are particularly effective at night when the outdoor air is cooler.