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Whole House Fans work much like attic fans , only
they do much more thorough job of cooling a home. Where attic fans only move
air trapped in the attic, in the space above the ceilings in your rooms. whole
house fans ventilate the entire house.
Whole house fans are used when the outside air is cool, as in the morning.
They draw air through your open windows and force it up through the ceiling,
into the attic where it is exhausted out the vents. In the process, the entire
house is cooled by fresh air. Whole house fans use much less energy and are
much cheaper to run than air conditioning.
Whole house fans typically have louvered-shutters over a vent at a central
location, such as your hall ceiling. The louvers prevent cooled or heated air
from escaping when the fan is not in use.
-- from California Life, The Sacramento Bee,
August 10, 1996.
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