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Studies show that the daily activities of a family of four can add more than 18 gallons of water a week into the air in a home. Moist air flows towards drier air to equalize itself. This equalization process can actually force indoor moisture through the ceiling and insulation into the attic. Moist attic air causes such problems as wet, ineffective insulation, and rotting of the attic roof. Attic roof fans serve two purposes, they exhaust this moist air out of the attic year round, and keep the attic cooler in summer, a huge boost to whole house cooling.

**Please note – If you are interested in in summer whole house ventilation, please click on “Whole House Ventilators” on the left hand sidebar.