How much does an air purifier cost per month in District of Columbia?

About $9.48 a month, assuming 50 W, 24 hours a day, 365 days a year at 25.98¢/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?

District of Columbia has the 9th 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 District of Columbia (August 2026 rates)

At 25.98¢ per kilowatt-hour — District of Columbia's average residential price in August 2026 — running an air purifier costs $114 a year. That is 43% more than the national average of $79.54. District of Columbia's residential rate is up 12.1% from August 2025, which moves this appliance from $102 to $114 a year.

Per hour: 1.3¢
Per day of use: 31.2¢
Per month: $9.48
Per year: $114

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 District of Columbia compares

District of Columbia pays 25.98¢/kWh, the 9th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $34.25 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
Connecticut	24.51¢	$8.95	$107
New Jersey	24.61¢	$8.98	$108
District of Columbia	25.98¢	$9.48	$114
New Hampshire	27.64¢	$10.09	$121
Rhode Island	28.18¢	$10.29	$123

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

What else costs about the same in District of Columbia

Refrigerator$104 a year in DC Desktop computer$104 a year in DC Dehumidifier$140 a year in DC

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 District of Columbia?: About $9.48 a month, assuming 50 W, 24 hours a day, 365 days a year at 25.98¢/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?: District of Columbia has the 9th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $79.54 a year.