Additionally, he advises DIY-ers to "Be prepared for insulation which ... Fans ducts need to be properly placed, as pumping hot, humid air into your attic could cause mold. "Ensure that the fan is ...

Installation is DIY-able, so you could potentially install a single fan for as little as $300, but most attics need two or three. So the final cost could be $600 to $1,500 or more. If you own a new ...