In most homes and many offices, heating systems and air conditioning systems share many of the same components. Cold air and hot air are routed through the same fans and ducts, and the same thermostat controls both functions.
So perhaps it is not surprising that some people might wonder whether their air conditioner uses gas because that is what their furnace uses.
The answer, however, is no. The air conditioning unit—the portion of the system that cools the air—operates on electricity. That is why your electricity bill often gets so expensive during the summer.
Your air conditioner works most efficiently when doors and windows are closed and you have eliminated potential sources of air leaks. So to cut down on your electric bill, try closing curtains to keep the sun from shining through windows will also help you air conditioner keep things cool.