It Cools. It Ventilates. It Exhausts. Whole house fans are a great way to provide NATURAL COOLING for your home. So how does it work? A whole house fan is used in lieu of air conditioning throughout the evening & night time, thus providing substantial energy savings. The purpose of the Whole House Fan is to accelerate the natural cooling effect of bringing cooler outside air into the house through open windows and flushing the heat out of your living and attic space. By cooling surface temperatures for added comfort, the Whole House Fan differs from a conventional central air conditioner that recycles indoor air and generally does not provide attic cooling. Another primary reason for ventilating your home is to dilute indoor air pollutants, odors & excess moisture.