How much does an air purifier cost per month in Illinois?

About $7.05 a month, assuming 50 W, 24 hours a day, 365 days a year at 19.32¢/kWh.

How many kilowatt-hours does an air purifier use?

Roughly 438 kWh a year under these assumptions, or 0.05 kWh for every hour it runs.

Is that expensive compared with other states?

Illinois has the 18th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $79.54 a year.

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Cost to run an air purifier in Illinois (August 2026 rates)

At 19.32¢ per kilowatt-hour — Illinois's average residential price in August 2026 — running an air purifier costs $84.62 a year. That is 6% more than the national average of $79.54. Illinois's residential rate is up 7.2% from August 2025, which moves this appliance from $78.97 to $84.62 a year.

Per hour: 1.0¢
Per day of use: 23.2¢
Per month: $7.05
Per year: $84.62

Assumption: 50 W, 24 hours a day, 365 days a year — 438 kWh a year. Mid-size HEPA unit on medium. High speed can triple the draw. Use the calculator to swap in the numbers from your own model.

How Illinois compares

Illinois pays 19.32¢/kWh, the 18th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $5.08 more a year than the typical U.S. household pays for the same use. Running the same air purifier costs $55.71 a year in Nevada and $207 in Hawaii, so where you live changes this bill by $151 a year.

State	Rate	Per month	Per year
Virginia	17.64¢	$6.44	$77.26
Delaware	18.70¢	$6.83	$81.91
Illinois	19.32¢	$7.05	$84.62
Ohio	19.38¢	$7.07	$84.88
Wisconsin	19.41¢	$7.08	$85.02

States ranked by average residential price, cheapest first. See all 51 states for an air purifier.

What else costs about the same in Illinois

Refrigerator$77.28 a year in IL Desktop computer$77.28 a year in IL Dehumidifier$104 a year in IL

Cutting the number down

Right-sizing to the room lets you run a bigger unit on low instead of a small one on high, which is quieter and cheaper for the same clean-air delivery.
A loaded filter forces the fan to work harder for less airflow, so late-life filters cost more per unit of clean air.

Questions

How much does an air purifier cost per month in Illinois?: About $7.05 a month, assuming 50 W, 24 hours a day, 365 days a year at 19.32¢/kWh.
How many kilowatt-hours does an air purifier use?: Roughly 438 kWh a year under these assumptions, or 0.05 kWh for every hour it runs.
Is that expensive compared with other states?: Illinois has the 18th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $79.54 a year.