As soon as we installed our fan in Hawaii, the temperature in the attic dropped 50 degrees and since installed, we have not had to use our air conditioning unit. The bedrooms are about 10 degrees cooler now. Great product. The motor is quiet and it's been working for three years without a hitch. It's important that the fan has an open source for air to be drawn up to it like an open trap door to feed interior air. Other wise, the unit will not be as efficient as it can be. Our unit works even when it's cloudy. It operates on UV rays!

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