How can a Whole House Fan cool your house when the temp outside is 80? With a whole house fan properly sized for your home, you should be able to exchange the air every 2-3 minutes. With this rate of air moving fast enough, it gives you a wind chill of 4-6 degrees so you are actually cooling your house to 74-76 degrees.
How do you calculate rate of exchange? Square footage of your home times the height of your ceilings will give you cubic feet. Now look at the spec. sheet, you are looking for (CFM) cubic feet of air per minute. Divide cubic feet by CFM this will give you the rate of exchange.
Does a Whole House Fan have to be centered in your home to work effectively? No, a whole house fan does not care where the air comes from; it matters where you open your windows. The closer the windows are to the fan the less you open the windows, the farther away the more you open. This way you can adjust how much air is coming from the windows.
Can I put a Whole House Fan any where I want? No, the placement of the whole house fan is dependent on how your house is built. An inspection is necessary to understand where it could go.
What about ventilation? A whole house fan can only pull in as much air as it can push out of your attic. This is part of the inspection process.
Are they noisy? Some whole house fans are noisy, usually these are aluminum bladed, direct drive, bolted together type units. The whole house fan we use is the best built on the market. Built by Triangle Engineering, USA. They are all steel, welded with 2 internal bearings; it is also designed with a self-adjusting belt, so we don't get noise from the motor.