There are three main types of attic fans, differentiated by their power source: solar, electric and passive. Photovoltaic (PV) panels power these types of attic fans. “The solar-powered fan is ...

If you need a fan to control moisture in the attic, you're better off with an electric (wired) fan that will run all the time ...

and then a new composite shingle roof. Finally, in July, we put in a whole-house cooling fan and whole-house heat-recirculating system (as well as two skylights, one seen in the center of the roof).