A solar-powered attic fan costs nothing to operate, but that doesn't necessarily make it a good investment. It depends on the condition of the attic. The post Should You Invest in a Solar-Powered ...

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 ...

Cost: $300 (attic insulation), $23 per 4' x 8' board (solar sheathing), $4,000 (new roof), $600 (whole-house fan), $570 (whole ... including fuel and oil for a gas-powered car, would have come ...