Whole-house fans are used in mild summer time conditions or to augment air conditioning. They are installed in a central hallway to pull fresh air through open windows. Warmer, stale air is vented away through the attic. Direct drive fans have a motor attached to a powerful fan and are easy to install since no attic joists need to be cut. It has a 2-speed pull chain. Thanks to a motor mounted just above and to the side of the fan, a belt-drive whole-house fan provides for smooth, quiet operation. Either option is such a great buy. Cooling down your house during the summer time using your air conditioner as little as possible is a GREAT way to SAVE
money, especially in these tough times! 
Thanks for the tips shared.I think Whole house fans are used in mild summer time conditions or to augment air conditioning. Really very important details to know about. Worth to read post. Keep sharing more.
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