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

About $7.81 a month, assuming 50 W, 24 hours a day, 365 days a year at 21.41¢/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?

Maryland has the 15th 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 Maryland (July 2026 rates)

At 21.41¢ per kilowatt-hour — Maryland's average residential price in July 2026 — running an air purifier costs $93.78 a year. That is 17% more than the national average of $80.20. Maryland's residential rate is up 13.7% from July 2025, which moves this appliance from $82.48 to $93.78 a year.

Per hour: 1.1¢
Per day of use: 25.7¢
Per month: $7.81
Per year: $93.78

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 Maryland compares

Maryland pays 21.41¢/kWh, the 15th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $13.58 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
Illinois	19.22¢	$7.02	$84.18
Ohio	19.45¢	$7.10	$85.19
Maryland	21.41¢	$7.81	$93.78
Pennsylvania	21.72¢	$7.93	$95.13
Michigan	23.05¢	$8.41	$101

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

What else costs about the same in Maryland

Refrigerator$85.64 a year in MD Desktop computer$85.64 a year in MD Dehumidifier$116 a year in MD

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 Maryland?: About $7.81 a month, assuming 50 W, 24 hours a day, 365 days a year at 21.41¢/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?: Maryland has the 15th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $80.20 a year.