I Bought this 30 Watt solar Attic Fan Back in July I already Have a Ridge Vent & Gable Vents & Eave Vents The first month I Installed I noticed Our electric Bill was cut in half By the Powerful 30 watt 1850 CFM pulling all that Hot air out of the attic I love our Solar Attic Fan A wise Investment also I bought the thermostat Helps to save your fan

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