Good ceiling fans complement air conditioners, and they allow homeowners to raise the thermostat by about 4 degrees without sacrificing comfort levels, according to the Energy Department.
“We set our temperature at 78 degrees, and with a quiet, giant ceiling fan, we feel comfortable,” Chu says. “The combination does the trick.”
On the other hand, setting the AC below 78 degrees can increase cooling costs by up to 40 percent, according to Con Edison, New York City’s energy provider.