Solar Powered Attic Fans draw hot attic air outside. This leaves your home at least 10 degrees cooler while increasing the efficiency of your air conditioning unit and extending the life of the unit. Also extends the life of your roof. In winter months the Solar Powered Attic Fan keeps air circulating and prevents mold and mildew build up. This attic fan is easy to install, requires NO electricity and No permits. The 10 watt vents up to 1200 sq. ft. of attic space. Our fans come with a 25 year warranty on ALL parts and a FREE thermostat. Don't be fooled by imitations. Our fan is made of stainless steel not plastic.