A whole house fan is a fan or exhaust system used to pull hot air out of the house. It is sometimes recognized as a attic fan. But is not. An attic fan ventilates only the attic and a ceiling fan circulates air in only one particular room. A whole house fan is a simple and inexpensive system of cooling a house. A whole house fan draws cool outdoor air into the house through windows and at the same time pushes warm indoor air outside through the attic vents, and the result is excellent ventilation, lower indoor temperatures, and improved cooling.
You can find two types of whole house fan. One of them is mounted on ceiling between the attic and living space. And the another one is ducted which is remotely mounted away from the ceiling and can exhaust heat from multiple locations and its operation is extremely quiet.
The operating cost of a whole house fan is about one-tenth of air conditioning. The fans draw 400-600 watts of electricity that takes eight cents or less per hour. Under the right circumstances a whole house fan can ventilate an entire house on electricity an air conditioner would use to cool a single room.
Installing of a whole house fan is very easy and simple. it is like a do it yourself project. Attics must be properly vented so that the air can escape back outdoors as quickly as it is being blown into attic. You should have vent area in the attic that is one square foot for every 1500 CFM of whole house fan.
There are also some drawbacks of a whole house fan. A whole house fan draws air into the house through open windows. That means that the air is unfiltered and may contain pollen or other allergens, which settle on floors and furniture making the house get dirty fast.