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A whole house fan can make a 78-degree evening feel like a reset button for your home, but only when the fan, attic, and open-window area work as one system. This Buyer's Review - Best Whole House Fan explains what separates a high-performing installation from a loud fan that disappoints on the first warm night. Whole house fans pull cooler outdoor air through open windows, across occupied rooms, and into the attic. The fan then pushes that air out through attic exhaust vents. They are most usef …