Whole-House Fans for Cooling

A whole-house fan is an effective means of cooling a house, and is far less expensive to run than an air conditioner. Whole-house fans can reduce indoor temperatures by 3 to 8 degrees F, depending on the outside temperature.

Find out how a whole-house fan can save you money by cutting your air conditioner use 15 to 55 percent.

Through prudent use of a whole-house fan, you can cut air conditioner use by 15 to 55 percent.

  • If a well-insulated house is closed up during the heat of the day, it will heat up inside slowly like an insulated ice cube. In the evening when it’s cooler outside than inside, and you open the windows, a whole-house fan blows
    the hot air out of the house.
  • The fan should be centrally located so that it draws air from all rooms in the house. Be sure your attic has sufficient ventilation to get rid of the hot air.
  • To ensure a safe installation the fan must have an automatic shutoff in case of fire.
  • Ceiling, paddle, and portable fans produce air motion across your skin that increases evaporative cooling.
  • A moderate breeze of one or two miles an hour can extend your comfort range by several degrees and will save energy by allowing you to set your air conditioner’s thermostat higher or eliminate the need for air-conditioning altogether.
  • Less frequent use of air conditioning by setting the thermostat higher will greatly cut cooling bills.

Excerpted from the Real Goods Solar Living Source Book,edited by Doug Pratt and executive editor John Schaeffer.Copyright (c) 1999, Real Goods. Reprinted by permsision of Chelsea Green Publishing Company and Real Goods.
Excerpted from Real Goods Solar Living Source Book,edited by Doug Pratt and executive editor John Schaeffer.


Terry V.
Terry V4 years ago


Vicky Barman
Past Member 5 years ago

great idea.........

Danuta Watola
Danuta Watola5 years ago

Great article thanks for sharing

Sandi C.
Sandi C5 years ago


New G.
W. C5 years ago


Michele Wilkinson

Thank you

Sulette Matthee
Sulette Botha6 years ago

Thanx for the info!

Jennifer C.
Past Member 6 years ago

Thanks for posting.

Susana L.
sue l6 years ago


Robert O.
Robert O6 years ago

Thank you.