Originally Posted by mitchel
I'm not an expert, but that makes no sense at all. How is this going to blow out the hot air that is acumulated in the attic?
Everything I read says that the fan is supposed to suck in cooler air from the outside and at the same time force the air that is in the living space and attic out of the house to help cool things off. What sense would it make to keep the super heated air in the attic?
There are attic fans and whole house fans. They are used in different ways. An attic fan is used to remove superheated air from the attic, and only the attic. It can be mounted on the roof, near the ridge or it can be gable mounted. It works better with soffit vents as it will draw relatively cooler air from the exterior, up the roof line and out of the house. It has a thermostat that you set so it goes on automatically.
A whole house fan is meant primarily to cool the house. It can be mounted in the ceiling that goes into the attic or it can be mounted in the gable wall. In either case it requires 2 shutter vents. One at the fan and one on the gable exhaust site. If you mount the fan in the ceiling without a shutter vent you will create a back pressure and the fan will not move the amount of air it's capable of. As a result you will think it's too small for the house.
I like to mount the fan on the gable as it eliminates all the back pressure. and exhausts directly to the exterior. As it does, it pulls the air in from the open windows and doors of the house, through the ceiling shutter, creating a breeze. If there aren't enough doors and windows open, the fan will not operate properly and you will think the fan is too small for the house. It will also suck air down the chimney pulling carbon monoxide into the house if the hotwater heater or the boiler are running.
It has the added benefit of removing the superheated air from the attic, but only when it's on.
So while your fan may be too small, it's more likely it's either installed incorrectly or being used incorrectly, or both.