Does Attic Ventilation Fan Help Cool House

As a certified licensed home inspector it is not correct to say too much ventilation is bad for an attic unless rain moisture is getting in.

Does attic ventilation fan help cool house.

Intake vents located at the lowest part of the roof under. 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. When an attic fan is operating during the hottest summer days the temperature in your attic can drop by as much as 50 degrees. Venting a homes attic is a very important best building practices will say 50 at the ridge and 50 at the soffits unobstructed.

Even though an attic exhaust fan can incrementally lower the temperature of a very hot attic using a fan does not stop the source radiant heat. Vents do provide some passive cooling but not enough to truly reduce your indoor temperatures. If the attic fan increases the comfort level of the house it may be worth it. 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.

Note that they do not push air in the house but draw fresh air into the attic enabling your house to cool almost instantly. Using a fan to blow hot air out of the attic doesn t address the radiant heat flow from the roof to the attic floor. 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. Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

During the day any cooler air brought in by the fan will be heated up immediately by the surrounding structure. Yes installing an attic fan raises the electric bill. Attic fans and whole house fans together can help with home ventilation but they serve different purposes. Much of that heat then conducts downward and finds its way into the house.

If the attic fan keeps the house cool enough so that the owners leave the ac off there is almost certainly an energy benefit. Most fans cannot keep up. Attic fans are critical because they are designed to cool off the attic providing relief to the unbearable temperatures of your home. Do not use mechanical means electric attic fans.