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The Attic fan (A.F.:Attic fan) or Whole house fan (W.H.F.: Whole house fan) circulates the air. It's especially good at pulling the hottest air (that's risen to the attic) out of the building. This also draws the cooler air up.

A fan uses less power than air conditioning. So for weather that is only a bit too warm, the attic fan can provide enough cooling. When the weather is hotter, or more cooling is desired, the attic fan can make the air conditioning more efficient.

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