During the hot, humid summer months in the southeastern U. S., air conditioning costs are a substantial part of the average home's utility bill. In Florida, for example, air conditioning accounts for about 30 percent of the annual utility bill for an all electric house.
Fans can help lower air conditioning costs.
Attic vent fans Conclusion Air circulating fans Air circulating fans, such as ceiling, oscillating or box fans, create air motion that permits comfort at higher temperature and humidity levels. This effect allows the air conditioner thermostat settings to be raised 2-6 degrees F, and each degree of increase saves about 8 percent in cooling costs. For example, a 4 degree F increase saves 32 percent in air conditioning costs. Air circulation fans can also extend the natural ventilation season by allowing homeowners to keep air conditioners off during more pleasant summer days. Payback periods depend on a home's location, the efficiency of its air conditioner and the homeowner's personal preferences.