Heating & Cooling · Midwest
Cost to run a box fan in Indiana
At Indiana’s average residential rate of 18.15¢ per kWh, a box fan drawing 75W for 8 hours a day costs about $3.31 a month. Change the numbers below to match how you actually use yours.
Summers in Indiana are humid enough for cooling to matter, but the season is compressed. Most of a box fan's annual consumption will land in a few peak weeks rather than spreading evenly across the year.
Quick answer
Based on 75W and 18.15¢/kWh, the Indiana average for May 2026.
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— per year
Why the cost differs in Indiana
Indiana has the 32nd cheapest residential electricity of the 51 US states and territories we track, at 18.15¢ per kWh against a national average of 18.44¢. That is -1.6% compared with the national figure. Indiana is midway through a coal-to-gas and coal-to-renewables transition, and the capital cost of that changeover is being recovered through successive rate cases, which is why rates have drifted upward from a historically cheap base. Retail service is regulated. The climate gives a genuine dual peak, with cold winters and humid summers both driving load.
For this appliance specifically, the difference works out to a saving of $0.64 a year against what the same box fan would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $114 a year; in Idaho it would cost $27.05. That spread of $86.83 is entirely down to location.
That works out to roughly 2.1% of a typical Indiana household's annual electricity bill - modest individually, though appliances in this range add up.
Indiana sits below the national average, so this box fan costs slightly less to run here than it would for a typical US household. How you use it will move the number far more than where you live.
Retail service in Indiana is regulated, so most households pay a tariff set through state rate cases rather than a shopped rate. The state average is a reasonable proxy, though your utility's specific tariff still varies.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| Indiana this page | 18.15¢ | $3.31 | $39.75 |
| US average | 18.44¢ | $3.37 | $40.38 |
| Idaho cheapest state | 12.35¢ | $2.26 | $27.05 |
| Hawaii most expensive | 52.00¢ | $9.50 | $114 |
Indiana electricity rate trend
Rates in Indiana have moved from 16.48¢ to 18.15¢ per kWh over the last twelve months of published data. Nationally, residential rates rose about 6.2% year over year.
2025-06 to 2026-05 · cents per kWh
About running a box fan
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.
What actually changes the cost
- 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.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
75W ÷ 1000 × 8h = 0.600 kWh/day × 18.15¢ = $0.109 per day
One honest caveat: Indiana’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
Questions about box fan running costs
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.