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

About $17.22 a month, assuming 50 W, 24 hours a day, 365 days a year at 47.18¢/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?

Hawaii has the 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 Hawaii (August 2026 rates)

At 47.18¢ per kilowatt-hour — Hawaii's average residential price in August 2026 — running an air purifier costs $207 a year. That is 160% more than the national average of $79.54. Hawaii's residential rate is up 22.5% from August 2025, which moves this appliance from $169 to $207 a year.

Per hour: 2.4¢
Per day of use: 56.6¢
Per month: $17.22
Per year: $207

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 Hawaii compares

Hawaii pays 47.18¢/kWh, the most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $127 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
Alaska	29.41¢	$10.73	$129
California	29.75¢	$10.86	$130
Massachusetts	30.48¢	$11.13	$134
Maine	32.11¢	$11.72	$141
Hawaii	47.18¢	$17.22	$207

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

What else costs about the same in Hawaii

Refrigerator$189 a year in HI Desktop computer$189 a year in HI Dehumidifier$255 a year in HI

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 Hawaii?: About $17.22 a month, assuming 50 W, 24 hours a day, 365 days a year at 47.18¢/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?: Hawaii has the most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $79.54 a year.