With balanced motor and blade design, power vents quickly exhaust heat or humidity from any attic. They work on a thermostat, which automatically turns the fan on when cooling is needed. Installed in the gable end of the house, the Gable-Mount Power Vent uses a thermostat to help prevent heat buildup to fight moisture buildup inside the attic. It operates 30% more quietly than comparable units and with 35% greater efficiency. What's more, since many homes already feature a gable or gable vent, it may not be necessary to cut a hole to install the gable-mount ventilator.