Do Attic Exhaust Fans Work

Temp 84f at 5pm.

Do attic exhaust fans work. However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the attic. Attic fans are installed at the roof level of your home to regulate the heat level. The attic fan kept my house cooler by 8f compared to pre fan installation days. Temp 92 f at 5pm.

Attic ventilation fans help cool air your attic by pushing out the stifling hot air from inside the attic and bringing in cool air from outside. Intake vents located at the lowest part of the roof under the eaves allow cool. Ideally this will lower the high temperatures that have built up in your attic. If there are not enough soffit gable or ridge vents a powerful attic exhaust fan can pull the air from your home through the ceiling if it is not perfectly sealed off.

Strong attic fans can actually back draft furnaces or water heaters by pulling combustion gases out of their burnersand into the home. This was observed on numerous days following the installation. Ridge vent must me installed per the manufactures instructions. More than 50 of the attic fans i see do not work and have current still live to the motor.

Do not use mechanical means electric attic fans. Attic fans exhaust hot air from your attic to the outside. Best ventilation is open soffit venting to a open vented ridge vent. Fresh air is pulled in from your soffits and or roof vent creating a draft through your attic.

During workdays would leave air conditioner off when leaving in the morning. This prevents hot air from seeping into your home and driving up the temperature in the living space which reduces the load on your air conditioner. Attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents soffit and gable and pushing hot air to the outside. Powered attic ventilators or attic fans just as they sound are designed explicitly for placing or installing in the attics.

After attic fan installation ac still off during day. Theory behind attic fans is they work on the principle of drawing hot air out of the attic and pushing it outside through the gable or roof levels. Exhausting moderate amounts of attic air as solar fans do can counteract this reducing infiltration my calculations show it to be about right for a vented attic but either do the calculations or measure the pressures. As hot air rises to the top fans push the hot air out and cool down the home by drawing in the fresh air.

This pressure balance improvement and the cooling provided by the air flow are most significant in the case of a leaky ceiling. This air is then exhausted through the fan to the outside. Cold air is drawn in from outside through the soffit vents or roof.