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Solar Powered Attic Fans are Cost Effective for Keeping Your Attic Cool and Dry - http://www.homeadditionplus.com/attic_info/Solar_Powered_Attic_Fans.htm

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from This Old House

How to Install a Solar Attic Fan

with General contractor Tom Silva | thisoldhouse.com | from How to Install a Solar Attic Fan

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This explains the pros and cons of each to the two main types of fans used for cooling attics and reducing your air conditioning costs.

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How Does a Solar Powered Attic Fan Work? A solar powered attic fan gives uninterrupted air flow throughout your attic. It vents out stale warm air and gives a fresher cooler air to your room through the process called “air exchange.” For a long lasting Attic fan, ensure your attic temperature does not exceed 25° above the outside air temperature during summer.

from Popular Mechanics

Installing An Attic Fan

Attic Fan - it was wonderful to open the front and back doors and turn on the attic fan!

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from The Home Depot

1000 CFM 12-Watt Solar Powered Attic Fan, Black