October 20, 2026
Ceiling fan vs air conditioner: how much cheaper is the fan?
Short answer
A ceiling fan draws about 30-50 watts versus roughly 1,000 watts for a 12,000 BTU air conditioner, so the AC uses around 20-30 times as much electricity per hour. At the U.S. average rate of 17 cents per kWh, running a fan for 8 hours costs about 5 cents, or roughly $1.50 a month, while the AC costs about $1.35 a day, or around $40 a month. A fan only makes you feel 3-4°F cooler and doesn't lower the air temperature, so it's best paired with the AC set a few degrees higher. Enter your state's rate in the calculator below to see your own AC cost.
If the goal is just to stop feeling hot, a fan costs a tiny fraction of what an air conditioner does. But a fan and an AC do different jobs, so the real question is when each one is the right tool.
The wattage gap
A ceiling fan typically draws 15-75 watts depending on speed, with 30-50 watts common on a medium setting. A window or portable AC draws 900-1,500 watts, and a central system 3,000-5,000 watts while it runs. Per hour, the AC uses roughly 20-30 times the electricity of a ceiling fan.
What that looks like on the bill
At the U.S. average residential rate of about 17 cents per kWh, running for 8 hours:
- Ceiling fan (40 W): about 0.3 kWh, or roughly 5 cents a day — about $1.50 a month.
- 12,000 BTU AC (about 1,000 W): about 8 kWh, or roughly $1.35 a day — about $40 a month.
Even leaving a fan on all day and night rarely adds more than $3-4 a month.
They don't cool the same way
A fan does not lower the air temperature. It moves air across your skin, which helps sweat evaporate and makes you feel about 3-4°F cooler. That works well when the air is warm but not extreme. In a heat wave, or when humidity is high, moving hot, damp air around may not be enough, and an AC is the better answer because it actually removes heat and moisture.
Using them together
The cheapest comfortable setup is usually both:
- Set the AC a few degrees higher, 78°F instead of 74°F, and run a fan so the room still feels cool. Each degree you raise the setpoint cuts cooling energy by roughly 6-8%.
- Turn the fan off when you leave. It cools people, not rooms, so an empty room gets nothing from it.
- In summer, set the ceiling fan to spin counterclockwise so it pushes air down.
Check it against your own rate
Electricity prices vary a lot by state, which changes how much you save by leaning on the fan. Use the AC electricity cost calculator to see what your AC costs per day at your state's rate, then compare it with the few cents a fan adds.