Ceiling Fan vs. Air Conditioning: How Much Does a Fan Really Save?
A fan costs pennies an hour. Whether it saves you anything depends on two habits.
By Mark Curant·Updated
Quick answer
At the U.S. average rate of 18.31¢/kWh, a ceiling fan costs about 1.28¢ an hour (0.55¢ for a DC-motor fan). A 3-ton central air conditioner costs about $0.47 an hour, roughly 37 times as much. But a fan doesn't cool the room; it cools you. It only saves money if you raise the thermostat (the Department of Energy says about 4°F) and turn the fan off when you leave. Do both, and two fans save about $27–$60 a year at U.S. average rates, and several times that in hot, expensive places.
We have ceiling fans at home, and they make a huge difference. My stores don't have them. That contrast is a good way to understand fans: they help the people sitting or sleeping under them, which suits a living room or bedroom, while a store with customers coming and going depends on the AC. The difference between cooling people and cooling a space is the key to whether a fan saves you money.
Fans and airflow: the series
- Ceiling fan vs. AC: how much a fan saves (this page)
- How much it costs to run a fan
- Ceiling fan buying guide
- Ceiling fan direction and settings
- Fans and airflow in your home
How a fan cools you without cooling the room
A fan doesn't lower the air temperature. Its motor actually adds a little heat. What it does is move air across your skin, which carries heat away and speeds up the evaporation of sweat. You feel cooler at the same temperature, the way a breeze feels cooler than still air. That's why a fan in an empty room is pure waste: there's no one there to feel the breeze.
The money comes from what you do with that comfort. If the room feels 4°F cooler with the fan on, you can set the thermostat 4°F higher, and the AC runs less. The fan's own running cost is the price of that saving.
What a fan costs to run compared with AC
Cost of one hour at the U.S. average residential rate of 18.31¢/kWh (July 2026), on high speed:
| What's running | Power (typical) | Cost per hour | Cost per month, 8 hours a day |
|---|---|---|---|
| Ceiling fan with a DC motor | 30 W (about 15–35 W on high, under 10 W on low) | 0.55¢ | $1.32 |
| Ceiling fan with a standard (AC) motor | 70 W (about 50–80 W on high) | 1.28¢ | $3.08 |
| Box fan (20") | 100 W (about 75–150 W on high) | 1.83¢ | $4.39 |
| Pedestal (standing) fan | 70 W (about 60–85 W) | 1.28¢ | $3.08 |
| Tower fan | 70 W (about 50–110 W) | 1.28¢ | $3.08 |
| Central air conditioner, 3-ton, SEER 14 | 2,571 W | $0.47 | $113 |
The cost in your state, in the Caribbean, Canada and Europe is in how much it costs to run a fan.
The two habits that decide whether a fan saves money
1. Raise the thermostat
Without this, a fan is an extra cost on top of the AC. Two standard fans running alongside the AC, with the thermostat left where it was, add about $58 a year at U.S. average rates in our example. Raise the setting 4°F and, using the common rule of thumb of about 3% less cooling energy per degree, the AC uses about 12% less. That's where the saving comes from. Our thermostat strategy has the schedule.
2. Turn it off when you leave
Fans cool people, not rooms. A fan left running in an empty bedroom all day costs money and changes nothing. Fans with a remote or a timer, or smart fans that can be scheduled, make this easier.
What two ceiling fans save, by location
Two ceiling fans, the thermostat raised 4°F, a 3-ton SEER 14 central AC, and our estimate of cooling hours for each climate. The fans run 1.5 times as many hours as the AC, because they're on whenever someone is in the room. "Net saving" is the AC saving minus what the fans cost to run.
| Location | Electricity rate | AC hours per year | AC saving from raising 4°F | Net saving, standard fans | Net saving, DC fans |
|---|---|---|---|---|---|
| U.S. average | 18.31¢ | 1,500 | $85 | +$27 | +$60 |
| New York | 29.90¢ | 900 | $83 | +$27 | +$59 |
| Ohio | 19.45¢ | 1,500 | $90 | +$29 | +$64 |
| California | 33.61¢ | 1,500 | $156 | +$50 | +$110 |
| Texas | 15.88¢ | 3,000 | $147 | +$47 | +$104 |
| Florida | 15.03¢ | 3,000 | $139 | +$44 | +$99 |
| Arizona | 15.38¢ | 3,000 | $142 | +$45 | +$101 |
| The Bahamas | 31.04¢ | 3,000 | $287 | +$92 | +$204 |
Two things stand out. The saving is real but modest: tens of dollars a year in most of the U.S., and about $92–$204 in the Bahamas. And the motor matters: a standard fan uses about twice the power of a DC fan, so it gives back a bigger share of the saving. If you're buying new fans, a DC motor is worth it. See the ceiling fan buying guide.
The bigger saving: fan instead of AC
The table assumes the AC runs as usual, just at a higher setting. The larger saving comes from not running the AC at all when you don't need it: mild evenings, spring and fall, a cool night with the windows open. Every hour you use a fan instead of the AC saves about $0.46 at U.S. average rates. A few hundred hours a year of that is worth more than the thermostat trick.
It has limits. A fan moves air but doesn't remove humidity, so in muggy weather the air stays clammy. And once the air is hotter than your skin, roughly the mid-90s °F, a fan blows hot air at you and stops helping. On those days, run the AC and use the fan to raise the setting.
Run your own numbers
Your numbers
AC saving from raising 4°F
$85
Cost of running the fans
$58
Net saving per year
+$27
Your AC's yearly cooling cost here is $706 (SEER 14). The saving uses the rule of thumb of about 3% per °F. Fan hours start at 1.5× the AC hours, because fans run whenever someone is in the room; change them to match how you use yours.
When fans don't help
- Empty rooms. No one to cool, so it's wasted power.
- Stores and other busy spaces where people come and go, or stand far from a fan. There the AC does the work.
- Very hot air. Above roughly body temperature, a fan can make you feel hotter.
- Humidity. A ceiling fan doesn't dry the air. For a clammy house, see house humid with the AC on.
- Your AC's own fan setting. Setting the thermostat fan to "On" is not the same as a ceiling fan, and it can raise humidity. See fans and airflow in your home.
Frequently asked questions
Is it cheaper to run a ceiling fan or the air conditioner?
Much cheaper to run the fan. At the U.S. average rate of 18.31¢/kWh a standard ceiling fan costs about 1.28¢ an hour on high and a DC-motor fan about 0.55¢, while a 3-ton central air conditioner costs about $0.47 an hour. The AC uses roughly 37 times the power.
Do ceiling fans actually lower your electric bill?
Only if you use them to run the AC less. A fan doesn't cool the room; it makes people feel cooler. The U.S. Department of Energy says a ceiling fan lets you raise the thermostat about 4°F with no loss of comfort, and that saving is what lowers the bill. Running fans without raising the thermostat just adds their cost: about $58 a year for two standard fans at U.S. average rates in our example.
Should I turn off the ceiling fan when I leave the room?
Yes. Fans cool people, not rooms. A fan spinning in an empty room uses electricity and does nothing for the temperature; it can even add a little heat from its motor.
How much can I save with a ceiling fan?
In our example (two ceiling fans, thermostat raised 4°F, U.S. average rates and hours), about $27 a year with standard fans and $60 with DC fans. In hot, expensive places it's several times more. The bigger saving comes from using fans instead of the AC on mild days and evenings: every hour the AC stays off saves about $0.46 at U.S. average rates.
Can a ceiling fan replace air conditioning?
In mild, dry weather, often yes. In heat and humidity, no: a fan moves air but doesn't cool it or remove moisture, and above about body temperature moving hot air can make you feel worse, not better. Use fans to stretch the AC, not to replace it on hot days.
Sources and method
- Raising the thermostat about 4°F with a ceiling fan, turning fans off in empty rooms: U.S. Department of Energy, Energy Saver: Fans for cooling.
- Electricity rates: EIA Electric Power Monthly, Table 5.6.A (July 2026); the Bahamas from the Bahamas cost page. Cooling hours are our climate estimates, as on the state pages.
- Fan wattages: an ENERGY STAR-listed 44" fan (17.6 W high, 2.7 W low), a manufacturer EnergyGuide label (44 W), and published watt-meter tests of standard and portable fans. Typical figures; check your fan's label.
- The 3%-per-°F saving and the 1.5× fan hours are rules of thumb and our assumptions, not measurements.