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 ...

Photovoltaic (PV) panels power these types of attic fans. “The solar-powered fan is generally mounted on the outside of the roof,” says Houghton. “It is used to circulate warm air from ...

Cost: $300 (attic insulation), $23 per 4' x 8' board (solar sheathing), $4,000 (new roof), $600 (whole-house fan), $570 (whole-house heater), $1,450 (two skylights) After $18,500 in rebates and ...