Whole-House and Attic Fans

Whole-house fans exhausting air into an unconditioned attic may have the side benefit of cooling the attic. But that depends on the time of day and the temperature of air in the attic. If the attic has cooled during the night, it is unwise to exhaust warm air from the home into the attic. In that case, a better solution may be a separate fan made especially to ventilate attics—or a whole-house fan which draws cool air from the attic and blows it into the home, forcing warm/hot air out through windows, doors, and/or exhaust vents.