Box Fan running cost, by state
A box fan drawing 75W costs about $40.16 a year at the US average electricity rate — but that average hides a fourfold spread. Pick your state for a real figure.
At the US average rate
75W , 8 hours a day, at 18.34¢/kWh.
About this appliance
A box fan is one of the cheapest comfort appliances to run, typically costing a few dollars per month even in continuous use. Used to exhaust hot air at night it can measurably reduce air conditioner runtime.
- Models vary widely, from about 45W to 120W. Check the nameplate on your own unit rather than assuming an average, because the spread is more than 2x.
- Insulation and air sealing reduce runtime, which lowers cost more reliably than adjusting the thermostat by a degree.
- If your utility offers time-of-use pricing, shifting this load off-peak can cut its cost substantially without using any less energy.
Annual cost in every state
Sorted cheapest first. Click any state for the full calculation with that state’s rate loaded.
| State | Rate /kWh | Per month | Per year | Relative |
|---|---|---|---|---|
| Nevada | 13.11¢ | $2.39 | $28.71 | |
| Nebraska | 13.25¢ | $2.42 | $29.02 | |
| Utah | 13.37¢ | $2.44 | $29.28 | |
| Louisiana | 13.49¢ | $2.46 | $29.54 | |
| Tennessee | 14.07¢ | $2.57 | $30.81 | |
| Arkansas | 14.12¢ | $2.58 | $30.92 | |
| North Dakota | 14.12¢ | $2.58 | $30.92 | |
| Kentucky | 14.26¢ | $2.60 | $31.23 | |
| Oklahoma | 14.33¢ | $2.62 | $31.38 | |
| Idaho | 14.37¢ | $2.62 | $31.47 | |
| North Carolina | 14.74¢ | $2.69 | $32.28 | |
| Mississippi | 14.88¢ | $2.72 | $32.59 | |
| Washington | 14.91¢ | $2.72 | $32.65 | |
| New Mexico | 15.06¢ | $2.75 | $32.98 | |
| Florida | 15.10¢ | $2.76 | $33.07 | |
| Montana | 15.14¢ | $2.77 | $33.16 | |
| Arizona | 15.18¢ | $2.77 | $33.24 | |
| Wyoming | 15.24¢ | $2.78 | $33.38 | |
| South Dakota | 15.36¢ | $2.81 | $33.64 | |
| West Virginia | 15.45¢ | $2.82 | $33.84 | |
| South Carolina | 15.55¢ | $2.84 | $34.05 | |
| Kansas | 15.71¢ | $2.87 | $34.40 | |
| Iowa | 15.93¢ | $2.91 | $34.89 | |
| Texas | 15.94¢ | $2.91 | $34.91 | |
| Missouri | 16.22¢ | $2.96 | $35.52 | |
| Oregon | 16.32¢ | $2.98 | $35.74 | |
| Georgia | 16.36¢ | $2.99 | $35.83 | |
| Alabama | 16.40¢ | $3.00 | $35.92 | |
| Colorado | 17.13¢ | $3.13 | $37.51 | |
| Virginia | 17.22¢ | $3.15 | $37.71 | |
| Indiana | 17.51¢ | $3.20 | $38.35 | |
| Minnesota | 17.52¢ | $3.20 | $38.37 | |
| Ohio | 19.19¢ | $3.50 | $42.03 | |
| Delaware | 19.29¢ | $3.52 | $42.25 | |
| Wisconsin | 19.56¢ | $3.57 | $42.84 | |
| Illinois | 19.89¢ | $3.63 | $43.56 | |
| Pennsylvania | 21.73¢ | $3.97 | $47.59 | |
| Maryland | 21.84¢ | $3.99 | $47.83 | |
| Michigan | 22.99¢ | $4.20 | $50.35 | |
| Connecticut | 24.32¢ | $4.44 | $53.26 | |
| District of Columbia | 24.39¢ | $4.45 | $53.41 | |
| Vermont | 24.44¢ | $4.46 | $53.52 | |
| New Jersey | 24.95¢ | $4.56 | $54.64 | |
| New Hampshire | 27.01¢ | $4.93 | $59.15 | |
| Alaska | 28.21¢ | $5.15 | $61.78 | |
| Rhode Island | 29.23¢ | $5.34 | $64.01 | |
| New York | 29.49¢ | $5.39 | $64.58 | |
| Maine | 29.59¢ | $5.40 | $64.80 | |
| Massachusetts | 29.61¢ | $5.41 | $64.85 | |
| California | 34.74¢ | $6.34 | $76.08 | |
| Hawaii | 52.72¢ | $9.63 | $115 |
Common questions
How many watts does a box fan use?
A typical box fan draws about 75 watts while running, with most models falling between 45W and 120W. Check the nameplate label or manual for your specific unit - the range is wide enough that averages can mislead.
How much electricity does a box fan use per day?
At around 8 hours of use a day and a 100% duty cycle, that works out to roughly 0.6 kWh per day, or about 18 kWh a month. Your actual figure depends on your usage and model.
Why does the cost differ so much between states?
Residential electricity rates across the US range from about 12.35 cents per kWh in North Dakota to 46.62 cents in Hawaii - nearly a fourfold difference. The same box fan, used identically, therefore costs almost four times as much to run in the most expensive state as in the cheapest.
Is it cheaper to run a box fan at night?
Only if you are on a time-of-use or variable tariff. On a flat rate, the time of day makes no difference to cost. If you are on time-of-use pricing, off-peak hours are typically materially cheaper, and shifting this load can reduce its cost without reducing usage.