We installed the attic fan with 10 watt solar panel on a slightly pitched roof in central Massachusetts in June. We were able to follow the included instructions easily, and the fan worked immediately once exposed to sun. Total installation about 1-2 hours. I do recommend the thermal switch if you plan on not letting it run continuously through the winter time. The fan operates noiselessly and we could see a difference in temperature of the upstairs apartment within the first couple of days!

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