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A whole house fan is a great way to bring cool night air into your home and save on air conditioning. These fans are designed to move large amounts of air and in order for them to work effectively they must be properly sized for the house. In order to purchase the proper size fan; multiply the square footage of the living area of the home and multiply by 3 this will give you the cfm of the fan. This calculation will work as long as you have 8 foot ceilings.
Another important component is the roof must have proper ventilation to push out the hot air from the home and attic. Gable vents, roof vents and ridge vents all will allow the hot air to escape when using a whole house fan. For every 750 cfm you need 1square foot of uninterrupted venting.