Ceiling Fan vs Window Air Conditioner: Which Costs Less to Run?
A fan moves air; an air conditioner refrigerates it. They're often framed as rivals, but they solve different problems at wildly different wattages.
Ceiling Fan · per month
$2.68
8 hours/day · 15–90 W
Window Air Conditioner · per month
$40.27
8 hours/day · 500–1,500 W
Verdict
The fan costs 5–10% as much per hour and wins whenever moving air is enough — which is more often than most people think, since a breeze makes a room feel several degrees cooler. The AC wins when humidity or real heat make air movement insufficient. The smart play is both: AC set warmer, fan making it feel cooler.
Side by side
| Ceiling Fan | Window Air Conditioner | |
|---|---|---|
| Typical power | 15–90 W | 500–1,500 W |
| Typical usage | 8 hours/day | 8 hours/day |
| Energy per month | 15 kWh | 219 kWh |
| Cost per month (US avg) | $2.68 | $40.27 |
| Cost per year (US avg) | $32.24 | $484 |
| Cost per month in Hawaii | $7.59 | $114 |
Rates as of May 2026. Adjust the assumptions on each appliance's page: Ceiling Fan · Window Air Conditioner.
Frequently asked questions
Which is cheaper to run: a ceiling fan or a window air conditioner?
At typical usage and the current U.S. average rate (18.4¢/kWh), the ceiling fan is cheaper: about $2.68/month versus $40.27/month for the window air conditioner — a difference of $37.59 per month.
How much could I save per year by choosing the ceiling fan?
About $451 per year at typical usage and average rates. In Hawaii (52¢/kWh) the annual gap grows to roughly $1,275.
Do these numbers apply to my state?
The ratio between the two stays the same everywhere, but the dollar gap scales with your rate — from Idaho at 12.4¢/kWh to Hawaii at 52¢/kWh. Open each appliance's page for the exact cost in your state.