How Fans Save on Cooling Expenses
Depending on the severity of your summers, a fan can work as an efficient pre-chiller before you switch on your AC, or even as your sole source of cooling. Using only a tenth as much power as your AC, a fan bringing in cooler night and/or morning air can lower inside temperatures by 5 degrees (or more) in just a few minutes. Homeowners living in dry climates with wide day/night temperature swings may be able to do without their AC system by simply switching the fan on during cool hours and then turning off the fan and shutting the house during the hottest times of the day.
Granted, whole-house fans arent perfect. They cant cool inside temps lower than outside temps, nor can they dehumidify. If you live in a humid region, youll still need to lean on your AC in the dog days of summer. And while most folks may prefer fresh outside air, if you suffer from allergies, realize that fans draw in outdoor pollen and dust.