A whole-house fan is a type of fan, or exhaust system commonly venting into a building’s attic, designed to pull hot air out of the building. It is sometimes confused with an attic fan. A whole-house fan pulls hot air out of a building and forces it into the attic space. This causes a positive pressure in the attic forcing air out through the gable and/or soffit vents, while at the same time producing a negative pressure inside the living areas which draws cool air in through open windows. Attic fans, by comparison, only serve to remove some hot air from the attic; no direct cooling effect is provided to the actual living space.