Whole-house fan is a kind of fan installed in a building's ceiling, designed to suck hot air out of the building. It is occasionally confused with an attic fan.
A whole-house fan sucks hot air out of a structure and forces it into the attic. This displaces the very hot air attentive in the attic (which is pushed out the gable-end or soffit vents). Then, with windows and/or doors open to the external, the whole-house fan draws cooler outside air into the building to replace the hot air (creating a cooling breeze whilst doing so).
Attic fans, by comparison, only serve to remove some hot air from the attic; no cooling effect is supply to the actual living space.
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