When used in conjunction with an air conditioner, a ceiling fan can lower energy costs, because you can set the thermostat of your air conditioner at a higher temperature.
(a ceiling fan; can lower; energy costs; because you can set the thermostat of your air conditioner at a higher temperature; T:When used in conjunction with an air conditioner) (you; can set; the thermostat of your air conditioner; at a higher temperature)
a ceiling fan you
can lower can set
energy costs because you can set the thermostat of your air conditioner at a higher temperature T:When used in conjunction with an air conditioner
the thermostat of your air conditioner at a higher temperature