How Much Does It Cost to Run an Air Purifier? $0.01/Hr, $5.51/Mo

45 W (15–100 W)Typical power draw

24 h/day, 30 days/monthAssumed use

1.08 kWhEnergy per day

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

On this page: Calculator Table How we calculated Sources

Power draw (watts) — typical for air purifier: 15–100 W; check your label Hours per day for an air purifier — effective run-hours Days per month — 30 = every day Months used per year — 12 for air purifier; seasonal loads do not run all year Quick-fill your state's EIA average rate Your rate (¢/kWh) — 17¢ = EIA 2025 annual US average (July 2026 monthly: 18.31¢)

Energy used: — per day

Cost per hour: —

Cost per day: —

Cost per month in use: —

Cost per year: —

an air purifier: energy cost only (45 W ÷ 1,000 × hours × rate); fixed fees and taxes extra.

What changes if… Electricity rates move Compare it with charging an EV at home

Slider nudges the rate for an air purifier; the URL keeps it.

## How much does it cost to run an air purifier?

The same an air purifier at 24 hours a day costs $3.89 a month at 12¢ and $14.58 at 45¢ — usage held constant, only the rate moving:

Table 1: How Much Does It Cost to Run an Air Purifier? $0.01/Hr, $5.51/Mo
Electricity rate	Per hour	Per day	Per month	Per year
12¢/kWh	$0.005	$0.13	$3.89	$47
15¢/kWh	$0.007	$0.16	$4.86	$59
17¢/kWh (US avg)	$0.008	$0.18	$5.51	$67
20¢/kWh	$0.009	$0.22	$6.48	$79
25¢/kWh	$0.011	$0.27	$8.10	$99
30¢/kWh	$0.013	$0.32	$9.72	$118
35¢/kWh	$0.016	$0.38	$11.34	$138
45¢/kWh	$0.020	$0.49	$14.58	$177

Typical power draw: 45 W (15–100 W)
Assumed use: 24 h/day, 30 days/month
Energy per day: 1.08 kWh
Cost per day: $0.18
Cost per month: $5.51
Cost per year: $67

Why this number

Running an air purifier at 45 watts for 24 hours a day costs about $0.18 a day and $5.51 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $67 a year. The formula for an air purifier: 45 W ÷ 1,000 × hours × your rate per kWh. For an air purifier your own rate changes the answer: at 12¢/kWh that month costs $3.89, at 45¢/kWh it costs $14.58.

An air purifier rated at 45 watts, run 24 hours a day, costs about $0.18 a day — about $5.51 a month, or $67 a year — at the US average electricity rate of 17¢/kWh. That places it 21th of the 40 appliances tracked here, near the bottom. It is not where a high bill comes from, and switching it off will not rescue one.

What actually drives this number

The EPA’s own figure for a standard room air cleaner running continuously is 394 kWh a year — the same as a modern refrigerator uses, except nobody thinks of an air purifier as a major appliance. Fan speed is the whole variable: the gap between the lowest setting and turbo is often a factor of five, and a correctly sized unit murmuring on low cleans a room about as well as an undersized one screaming on high, for a fraction of the electricity. An ENERGY STAR certified model does the same job for roughly 183 kWh a year. Filter cost, not electricity, is usually the bigger line anyway.

For an air purifier the unit that matters is the kilowatt-hour, not the kilowatt : 45 W is only the rate of use, and 24 hours a day is what turns it into the 394 kWh a year you are actually billed for. On that yearly measure its nearest always-on neighbor is the refrigerator at about 394 kWh.

Where this number comes from

Benchmark: 394 kWh/year — ENERGY STAR’s air purifier page states the same 394 kWh/yr for a standard unit run continuously
Assumed use for an air purifier: 24 h/day, 30 days/month, 12 months/year — every one of these is editable in the calculator above
Rate for an air purifier: 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), from EIA Electric Power Monthly, Table 5.6.A ; the state selector above fills in yours

Putting Air purifier in proportion

At 17¢/kWh, an air purifier next to the rest of the bill:

Air purifier at $5.51 a month is close to Well pump at $5.10, and just under Electric blanket at $8.16
One hour of an air purifier uses as much as roughly an hour of a typical always-on device
Over a year an air purifier comes to $67 — about 0.4 months of a $150 monthly electricity bill

For an air purifier: this is an always-on load, and that is the whole story. Air purifier’s wattage is unremarkable; the 24-hour duty cycle is what puts an air purifier where it is. Reducing run-hours is usually impossible for an air purifier, which makes efficiency at purchase time the only real decision. On this site’s own numbers, an air purifier lands at #21 of 40 on the monthly-cost ranking, at about $5.51 for a typical month.

The formula, in full

The 45 W arithmetic for an air purifier, step by step:

Watts to kilowatts. 45 W ÷ 1,000 = 0.04 kW.
Energy per day. 0.04 kW × 24 hours = 1.08 kWh.
Cost per day. 1.08 kWh × $0.17 = $0.18.
Cost per month. $0.18 × 30 days = $5.51.

For an air purifier the two levers are run-hours (24 h/day here) and your rate; at 24 hours a day, 45 W adds up — which is why always-on loads dominate the rankings.

Other always-on loads: Refrigerator ($67/yr), Well pump ($62/yr), Humidifier ($51/yr). Closest on annual cost: Treadmill ($62/yr), Clothes dryer ($79/yr). Across all other always-on loads here, the cheapest is Water softener at $0.37/mo and the priciest is Pool pump at $40.80/mo.

The an air purifier table above runs a fixed rate ladder (12–45¢); the state quick-fill uses July 2026 averages from EIA Electric Power Monthly, Table 5.6.A .

Put an air purifier ($5.51 a month) against everything else in the electricity cost calculator , check your state’s rate , or browse all 40 appliances ; year-round high bills: solar savings calculator .

Frequently asked questions

How much does it cost to run an air purifier per hour?

About $0.008 an hour for an air purifier at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), for a 45 W unit. The calculation is 45 ÷ 1,000 × 1 hour × $0.17 per kWh. At 30¢/kWh the same hour costs $0.013.

How much does an air purifier add to my monthly bill?

Roughly $5.51 a month for an air purifier at 24 hours a day, 30 days a month, 17¢/kWh. That is about $67 a year if you use it that much year-round. For an air purifier, change the 24-hour default to your own use — run-time moves the total as much as the 45 W does.

How many watts does an air purifier use?

Typically around 45 W, with real units ranging from about 15 to 100 W depending on size, model and setting. The nameplate on your own unit is the figure to trust — these are typical values for planning, not a measurement of your appliance.

Why is my actual bill higher than the an air purifier figure?

$5.51 a month is the energy cost of an air purifier alone; your bill adds fixed connection charges, delivery fees, taxes and every other load. Add the other appliances in the index to an air purifier for the controllable part of the bill.

How we calculated this

Worked for an air purifier: 45 W ÷ 1,000 × 24 h × $0.17 = $0.18 a day; × 30 days = $5.51 a month; × 12 months in use = $67 a year. 45 W and 24 h are the typical figures cited for an air purifier; 17¢ is EIA’s 2025 annual US average.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

Where to go next

Cost to run well pump — The next cheaper item on the list: $5.10 a month against an air purifier’s $5.51.
Cost to run electric blanket — The next pricier item: $8.16 a month, which puts an air purifier in proportion.
All 40 appliances ranked by monthly cost — Air purifier is 21 of 40; the full ranking at 17¢/kWh.
Electricity cost calculator — Any wattage and hours, not just an air purifier — with the state quick-fill.
Find your electricity rate by ZIP — Your own utility’s average rate, sent straight into the an air purifier calculator.