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FAQ

What is the difference between whole house cooling and air conditioning?

Whole house cooling draws hot trapped air out of the home while bringing cooler air inside. Air conditioning uses a compressor to remove humidity and chill air.  By extending the hours of natural cooling and limiting the hours the Air Conditioner is run, you can experience savings while doing your part to reduce energy consumption.

Can I use both an air conditioner and a whole house fan?

YES, definitely, but not at the same time. The whole house fan should be used when the indoor air temperature is warmer than the outside temperature. The air conditioner when the reverse is true. Normally, the whole house fan in the evening, night and early morning hours and, if needed, the air conditioner during the heat of the day.

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 volume of your home every 3-10 minutes. This rate of air movement gives you a cooling effect of 4-6 degrees, so your home can feel as if it is 74-76 degrees.

How do you calculate the ideal rate of exchange in CFM?

The square area of your home in feet is multiplied by the height of your ceiling for the volume of the home in cubic feet. The CFM output of the fans are listed on the Products page.  Divide the volume in cubic feet by the industry air exhange standard of 3 and you will get the targeted CFM.  For example, a 1,200 square foot home with 8 foot ceilings will have a volume of 9,600 cubic feet. Divide 9,600 by 3 minute target air exchange and you have an ideal air exchange rate of 3,200 CFM.

Does a Whole House Fan have to be centered in your home to work effectively?

No, a Whole House Fan is not as affected by where the air comes from; but it does matter where your open windows are located. The closer the windows are to the fan, the less you would open the windows; the farther away, the more you would open them. In this way, you can adjust how much air is coming from the windows.

How do I get the Breeze Effect from my Fan?

A Whole House Fan is very effective in moving a large quantity of air.  The 24 inch fan, for example moves 5,600 CFM.  If 5,600 cubic feet of air per minute is moved through one window you will feel a very consistent breeze. To decrease the strength of the breeze simply open another window.  Now the 5,600 CFM is divided between two windows at 2,800 CFM per window, 4 windows would change the air flow per window to 1,400 CFM.  (A room fan moves about 1,400 CFM) Opening more windows doesn’t decrease the overall airflow, but decreases the airflow per opening for less breeze per window.  To increase the Breeze Effect, target the area of the house by closing some windows.

Can I put a Whole House Fan anywhere I want?

The placement of the whole house fan depends on how your house is built. An inspection is necessary to determine where it should be placed.

What about ventilation?

A whole house fan can only pull in as much air as it can push out of your attic. As part of the inspection process, we will check to make sure that you have adequate ventilation.

Are they noisy?

Past fans had a reputation for being noisy.  Using insulated ducts, and optimized motors bedroom Whole House Fans are as little as 44dBA.  (About the same volume as an oscillating fan on low).