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

About $12.27 a month, assuming 50 W, 24 hours a day, 365 days a year at 33.61¢/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?

California has the 2nd most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $80.20 a year.

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Cost to run an air purifier in California (July 2026 rates)

At 33.61¢ per kilowatt-hour — California's average residential price in July 2026 — running an air purifier costs $147 a year. That is 84% more than the national average of $80.20. California's residential rate is up 2.9% from July 2025, which moves this appliance from $143 to $147 a year.

Per hour: 1.7¢
Per day of use: 40.3¢
Per month: $12.27
Per year: $147

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 California compares

California pays 33.61¢/kWh, the 2nd most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $67.01 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 Louisiana and $210 in Hawaii, so where you live changes this bill by $155 a year.

State	Rate	Per month	Per year
New York	29.90¢	$10.91	$131
Massachusetts	30.49¢	$11.13	$134
Maine	32.41¢	$11.83	$142
California	33.61¢	$12.27	$147
Hawaii	48.00¢	$17.52	$210

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

What else costs about the same in California

Refrigerator$134 a year in CA Desktop computer$134 a year in CA Dehumidifier$181 a year in CA

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 California?: About $12.27 a month, assuming 50 W, 24 hours a day, 365 days a year at 33.61¢/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?: California has the 2nd most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $80.20 a year.