Cents an hour instead of dollars. Here is what each CentricAir model costs to run, how that stacks up against central air, and a full summer of savings with the math shown.
A whole house fan saves money by cooling your home on cents an hour. At the 2026 U.S. average electricity price of 18.2 cents per kWh, a CentricAir 3.4 costs about 7 cents an hour to run, while a typical 3 ton central air conditioner costs about 60 cents. Using the fan instead of AC on summer evenings cuts the electricity used for those hours by about three quarters, which adds up to hundreds of dollars a year for many homes. Comfort Cool says a whole house fan can save up to 50 to 90 percent on cooling costs.
Most of a summer electric bill is the air conditioner, and a lot of that runtime happens after the sun goes down. The house is still holding the day’s heat, so the AC keeps running even when the air outside has turned cool. A whole house fan takes over those hours and uses about as much power as a few old 100 watt light bulbs.
How much does a whole house fan cost to run?
About 4 to 14 cents an hour for a CentricAir fan at the U.S. average electricity price. The higher your rate, the more each hour of AC you replace is worth.
The formula works for any fan: multiply its watts by your price per kWh, then divide by 1,000. For a CentricAir 3.4, that is 382 × 18.2 ÷ 1,000, or about 7 cents an hour.
| Model | Watts | Cost per hour (18.2¢/kWh) |
|---|---|---|
| CentricAir 2.0 | 207 | about 4¢ |
| CentricAir 2.7 | 288 | about 5¢ |
| CentricAir 3.4 | 382 | about 7¢ |
| CentricAir 4.0 | 623 | about 11¢ |
| CentricAir 4.0 ECM (high) | 749 | about 14¢ |
Watts from each model’s page on centricair.com. 18.2¢ is EIA’s projected 2026 U.S. average residential price (September 2026 outlook). Your own rate is on your utility bill.
How does that compare with central air?
A central air conditioner draws about 8 to 10 times more power than a CentricAir 3.4 while it runs.
Air conditioners are sized in tons, and 1 ton is 12,000 BTU per hour. A 3 ton unit with an energy efficiency ratio (EER) of 11 draws about 3,270 watts (36,000 ÷ 11). At 18.2 cents per kWh, that is about 60 cents for every hour the compressor runs.
Cost per hour at 18.2¢/kWh. AC figures assume an EER of 11. Older or less efficient systems cost more.
Part of why the running cost stays so low is the motor. This one minute video from CentricAir shows the German engineered fan inside the system.
How much can you save in one summer?
In our example, the fan uses about 77 percent less electricity than the AC for the same evening hours. Every assumption is below, so you can swap in your own.
- Season: 120 evenings when it is cooler outside than in, roughly June through September.
- Hours: 6 a night, 720 hours in all.
- Fan: a CentricAir 3.4 at 382 watts, about 275 kWh for the season.
- Air conditioner: a 3 ton unit at 3,270 watts. Compressors cycle on and off, so we assume it would have run half those hours, about 1,177 kWh.
| 720 evening hours | Electricity used |
|---|---|
| 3 ton central AC (running half the time) | 1,177 kWh |
| CentricAir 3.4 whole house fan | 275 kWh |
| You save | 902 kWh |
To see your dollar savings, multiply 902 kWh by the price per kWh on your utility bill. For many homes that adds up to hundreds of dollars a year, and more where electricity is expensive or the AC runs most evenings.
That only counts the evening hours the fan replaces. Starting the day with a cooler house may also mean less AC the next afternoon, but we left that out to keep the estimate conservative.
Comfort Cool says a whole house fan can save up to 50 to 90 percent* on cooling costs, depending on your climate, your home and how many AC hours the fan replaces.
*Comfort Cool estimate, not a guarantee. Your savings will vary.
What changes how much you save?
Four things: how cool your nights are, what you pay for power, how much AC you run now, and how well the fan is sized and sealed.
- Cool nights. The Department of Energy’s Building America program says whole house fans work best where summer nights cool down to about 67°F or below. More cool nights means more hours the fan can cover.
- Your rate. The higher your price per kWh, the more each hour saves. Some utilities charge more in the late afternoon and evening, so check your plan.
- Your AC habits. If the AC runs every summer evening now, the fan has a lot to replace. If you rarely use AC, you will save less.
- Sizing and sealing. An undersized fan cools slowly, and a damper that leaks lets conditioned air into the attic. Our sizing guide handles the first. Every CentricAir system includes a backdraft damper for the second.
How do you figure your own payback?
Divide what you pay for the fan and installation by what you expect to save each year.
CentricAir whole house fans are listed from $849 to $1,949 on centricair.com as of September 2026, before installation. Add your installer’s quote, then run the summer example above with your own rate and hours.
Check for a rebate first. Some utilities offer rebates on whole house fans, which shortens the payback. See our utility rebate page and installation cost guide.
Pick the model sized for your house, then plug its watts into the formula above.
Watch more from CentricAir
More videos from the CentricAir YouTube channel. Click any video to play it right here, or subscribe for new installs, tips and product walkthroughs.
Frequently asked questions
Is a whole house fan cheaper to run than air conditioning?
Yes, by a wide margin. At the 2026 U.S. average electricity price, a CentricAir 3.4 costs about 7 cents an hour to run. A 3 ton central air conditioner costs about 60 cents for every hour its compressor runs.
How much electricity does a whole house fan use?
CentricAir models use between 143 and 749 watts, depending on size and speed. Six hours on a 382 watt fan uses about 2.3 kWh.
Can a whole house fan replace my air conditioner?
In climates with cool, dry nights, it can take over most evenings, nights and early mornings. You will still want AC on the hottest afternoons and on warm, humid nights.
Does running a whole house fan all night cost a lot?
No. Eight hours on a CentricAir 3.4 costs about 56 cents at the 2026 U.S. average electricity price.
Keep reading
Sources
- U.S. Energy Information Administration, Short-Term Energy Outlook: Electricity, released Sept. 9, 2026.
- U.S. Energy Information Administration, California Electricity Profile 2024, released Nov. 10, 2025.
- U.S. Department of Energy, Building America Solution Center (PNNL), Whole-House Fans, updated Sept. 29, 2022.
- CentricAir product specifications and prices, centricair.com, accessed Sept. 2026.