How much does a box fan cost per month in Delaware?

About $1.75 a month, assuming 75 W, 10 hours a day, 150 days a year at 18.70¢/kWh.

How many kilowatt-hours does a box fan use?

Roughly 112 kWh a year under these assumptions, or 0.07 kWh for every hour it runs.

Is that expensive compared with other states?

Delaware has the 19th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $20.43 a year.

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Cost to run a box fan in Delaware (August 2026 rates)

At 18.70¢ per kilowatt-hour — Delaware's average residential price in August 2026 — running a box fan costs $21.04 a year. That is 3% more than the national average of $20.43. Delaware's residential rate is up 11.0% from August 2025, which moves this appliance from $18.96 to $21.04 a year.

Per hour: 1.4¢
Per day of use: 14.0¢
Per month: $1.75
Per year: $21.04

Assumption: 75 W, 10 hours a day, 150 days a year — 112 kWh a year. 20-inch box fan on high. Low speed roughly halves the draw. Use the calculator to swap in the numbers from your own model.

How Delaware compares

Delaware pays 18.70¢/kWh, the 19th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to 60.8¢ more a year than the typical U.S. household pays for the same use. Running the same box fan costs $14.31 a year in Nevada and $53.08 in Hawaii, so where you live changes this bill by $38.77 a year.

State	Rate	Per month	Per year
Minnesota	17.20¢	$1.61	$19.35
Virginia	17.64¢	$1.65	$19.84
Delaware	18.70¢	$1.75	$21.04
Illinois	19.32¢	$1.81	$21.73
Ohio	19.38¢	$1.82	$21.80

States ranked by average residential price, cheapest first. See all 51 states for a box fan.

What else costs about the same in Delaware

Microwave$20.48 a year in DE Electric kettle$20.48 a year in DE Incandescent bulb$20.48 a year in DE

Cutting the number down

Pointing one out of an upstairs window at night pulls cool air through the whole house for a fraction of what cooling it costs.
Box fans are cheap to run but not free: continuous summer use adds up to real kilowatt-hours.

Questions

How much does a box fan cost per month in Delaware?: About $1.75 a month, assuming 75 W, 10 hours a day, 150 days a year at 18.70¢/kWh.
How many kilowatt-hours does a box fan use?: Roughly 112 kWh a year under these assumptions, or 0.07 kWh for every hour it runs.
Is that expensive compared with other states?: Delaware has the 19th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $20.43 a year.