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Are Whole house fans efficient?

“The Whole House Fan is the single most effective tool to reduce your energy bill.” 

- Pacific Gas & Electric Company (PG&E)

“Whole house fans are the number one energy-saving device available” 

- So Cal Edison

"Whole house cooling using a whole house fan can substitute for an air conditioner most of the year in most climates.” 

- U.S. Dept. of Energy  

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