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This 40 watt solar Attic Fan by Quiet Cool needs no wiring when you install it. You can run this fan 24/7 because it has a built in inverter that switches over to electricity once the sun goes down. You don't have to worry about turning the fan on and off, it has a built-in preset thermostat turns your fan on and 88 degrees and off at 77 degrees. The energy efficient DC motor requires no maintenance.