Attic exhaust fan is motorized ventilation fans which circulate the air in the attic through the thermostat. It switches the fan on or off either automatically or sends an alert so that you can do it manually. As hot air flows upwards and out of the attic, additional vents suck the fresh air inside.

Attic fans are typically used during summer time when temperatures can soar to 120 degrees. Higher temperature increases utility bills and shortens the useful life of home insulation materials. Installing an attic fan and a few vents solve the problem instantly.

Majority of the attic fans are automatic; they are thermostatically controlled and turn on only when needed. Research shows that heat in the attic accounts for 25% of the total cooling bill, so these fans are a great investment.

There are a few common signs for an overly hot attic including bulges in the felt, curled up shingles and frost inside the attic on winter days. The trapped moisture turns into frost during winters and cannot escape due to lack of ventilation. It can cause the entire roof to rot.

You will also need to check the existing soffit vents to make sure they are not clogged with dirt or debris. During humid weather, the air movement from these vents is strong enough to attract light seeds from nearby trees and bushes into the screens. The debris will need to be cleaned if you want your new fan to work correctly.

You can buy two kinds of attic fans, one that is installed in the roof and other type is mounted in the gable wall. The roof fan can be fixed by just cutting an opening in the ceiling and installing it. The gable wall fan can be installed in place of an already existing gable vent and is easier to install than a roof fan.