How much does it cost to run a large room HEPA air purifier?
A large room HEPA air purifier costs about 1.3¢ per hour, 30¢ a day, $9.20 a month and $110 a year at typical use (24 hours a day) and the U.S. average rate of 17.99¢/kWh. Large-room purifiers rated for 500-1,500 sq ft draw 50-150 W on high but often run on Auto at 10-30 W.
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Cost by setting
| Setting | Watts | Per hour | Per day | Per month | Per year |
|---|---|---|---|---|---|
| Low | 15 | 0.3¢ | 6.5¢ | $1.97 | $24 |
| Medium | 35 | 0.6¢ | 15¢ | $4.60 | $55 |
| High | 70 | 1.3¢ | 30¢ | $9.20 | $110 |
At 24 hours a day and 17.99¢/kWh.
Cost by hours of use
| Hours per day | kWh/day | Per day | Per month | Per year (all year) |
|---|---|---|---|---|
| 1 hour | 0.09 | 1.7¢ | $0.51 | $6 |
| 2 hours | 0.16 | 2.9¢ | $0.89 | $11 |
| 4 hours | 0.30 | 5.4¢ | $1.64 | $20 |
| 8 hours | 0.58 | 10¢ | $3.15 | $38 |
| 12 hours | 0.85 | 15¢ | $4.67 | $56 |
| 24 hours | 1.68 | 30¢ | $9.20 | $110 |
Cost to run a large room HEPA air purifier in every state
The same large room HEPA air purifier costs $76 a year in North Dakota and $267 in Hawaii, at each state's average residential rate (12 months ending July 2026).
| State | Rate | Per hour | Per month | Per year |
|---|---|---|---|---|
| North Dakota | 12.32¢ | 0.9¢ | $6.30 | $76 |
| Idaho | 12.65¢ | 0.9¢ | $6.47 | $78 |
| Nebraska | 12.86¢ | 0.9¢ | $6.58 | $79 |
| Louisiana | 12.99¢ | 0.9¢ | $6.64 | $80 |
| Utah | 13.32¢ | 0.9¢ | $6.81 | $82 |
| Nevada | 13.36¢ | 0.9¢ | $6.83 | $82 |
| Arkansas | 13.43¢ | 0.9¢ | $6.87 | $82 |
| Tennessee | 13.56¢ | 0.9¢ | $6.93 | $83 |
| Oklahoma | 13.70¢ | 1.0¢ | $7.01 | $84 |
| Montana | 13.84¢ | 1.0¢ | $7.08 | $85 |
| Kentucky | 13.92¢ | 1.0¢ | $7.12 | $85 |
| Missouri | 13.95¢ | 1.0¢ | $7.13 | $86 |
| Wyoming | 14.01¢ | 1.0¢ | $7.16 | $86 |
| Washington | 14.12¢ | 1.0¢ | $7.22 | $87 |
| Iowa | 14.13¢ | 1.0¢ | $7.23 | $87 |
| South Dakota | 14.20¢ | 1.0¢ | $7.26 | $87 |
| Mississippi | 14.77¢ | 1.0¢ | $7.55 | $91 |
| North Carolina | 14.77¢ | 1.0¢ | $7.55 | $91 |
| Kansas | 15.09¢ | 1.1¢ | $7.72 | $93 |
| Georgia | 15.12¢ | 1.1¢ | $7.73 | $93 |
| New Mexico | 15.32¢ | 1.1¢ | $7.83 | $94 |
| Florida | 15.39¢ | 1.1¢ | $7.87 | $94 |
| Arizona | 15.40¢ | 1.1¢ | $7.87 | $94 |
| West Virginia | 15.48¢ | 1.1¢ | $7.92 | $95 |
| Oregon | 15.50¢ | 1.1¢ | $7.93 | $95 |
| South Carolina | 15.64¢ | 1.1¢ | $8.00 | $96 |
| Texas | 15.96¢ | 1.1¢ | $8.16 | $98 |
| Minnesota | 16.22¢ | 1.1¢ | $8.29 | $100 |
| Alabama | 16.44¢ | 1.2¢ | $8.41 | $101 |
| Virginia | 16.48¢ | 1.2¢ | $8.43 | $101 |
| Colorado | 16.58¢ | 1.2¢ | $8.48 | $102 |
| Indiana | 16.94¢ | 1.2¢ | $8.66 | $104 |
| Delaware | 17.79¢ | 1.2¢ | $9.10 | $109 |
| Ohio | 18.25¢ | 1.3¢ | $9.33 | $112 |
| Wisconsin | 18.74¢ | 1.3¢ | $9.58 | $115 |
| Illinois | 18.79¢ | 1.3¢ | $9.61 | $115 |
| Pennsylvania | 20.70¢ | 1.4¢ | $10.58 | $127 |
| Maryland | 21.03¢ | 1.5¢ | $10.75 | $129 |
| Michigan | 21.05¢ | 1.5¢ | $10.76 | $129 |
| New Jersey | 23.78¢ | 1.7¢ | $12.16 | $146 |
| Vermont | 23.80¢ | 1.7¢ | $12.17 | $146 |
| District of Columbia | 24.20¢ | 1.7¢ | $12.37 | $148 |
| New Hampshire | 26.67¢ | 1.9¢ | $13.64 | $164 |
| Alaska | 26.85¢ | 1.9¢ | $13.73 | $165 |
| Connecticut | 27.99¢ | 2.0¢ | $14.31 | $172 |
| New York | 28.39¢ | 2.0¢ | $14.52 | $174 |
| Rhode Island | 29.27¢ | 2.0¢ | $14.97 | $180 |
| Maine | 29.31¢ | 2.1¢ | $14.99 | $180 |
| Massachusetts | 30.43¢ | 2.1¢ | $15.56 | $187 |
| California | 32.99¢ | 2.3¢ | $16.87 | $202 |
| Hawaii | 43.51¢ | 3.0¢ | $22.25 | $267 |
Most efficient large room HEPA air purifier models
The lowest-energy ENERGY STAR certified models in the most common size (208–282 sq ft), out of 236 certified models. In this class, the best model costs $16 a year to run. The least efficient costs $30. Same size, $14 a year apart.
| Brand | Model | Room size | kWh/yr | Cost/yr | Shop |
|---|---|---|---|---|---|
| MegaLight | AP-HCE99-WT Most Efficient | 211 | 89 | $16 | Amazon |
| AROEVE | DH-JH021US-A00 Most Efficient | 214 | 101 | $18 | Amazon |
| Blueair | 3132111100 Most Efficient | 237 | 103 | $19 | Amazon |
| Blueair | 3232111101 | 228 | 108 | $19 | Amazon |
| Aeocky | LunaPure-EJH001 Most Efficient | 212 | 109 | $20 | Amazon |
| Blueair | 3232111100 | 225 | 110 | $20 | Amazon |
| Blueair | 4512311000 Most Efficient | 250 | 110 | $20 | Amazon |
| Atmosphere MINI | 124746** | 211 | 122 | $22 | Amazon |
| Bosch | Air 4000 | 242 | 124 | $22 | Amazon |
| CUCKOO | CAC-AB0610FI | 231 | 126 | $23 | Amazon |
Yearly cost from the official annual energy use and 17.99¢/kWh. Look up any model in the calculator with “Look up my exact model”. Source: ENERGY STAR, updated 2026-10-21. Amazon links search for the exact model; as an Amazon Associate we earn from qualifying purchases.
How to cut the cost
- Use Auto mode; on high continuously it can cost 3-5 times as much as Auto.
- Keep doors open between rooms it serves, or close them and move it to where you are.
- Vacuum the pre-filter monthly and replace HEPA filters on schedule.
- Turn off the display and Wi-Fi features if you don't use them.
Cheaper ways to get the job done
Filters the whole house through existing ductwork whenever the HVAC fan runs.
See options on AmazonWe may earn a commission from qualifying purchases. It never changes the numbers we show. Disclosure.
Compare with similar appliances
| Appliance | Watts | Typical use | Per month | Per year |
|---|---|---|---|---|
| Large room HEPA air purifier | 70 | 24 hours a day | $9.20 | $110 |
| Air purifier | 40 | 24 hours a day | $5.26 | $63 |
| Dehumidifier | 500 | 24 hours a day for 6 months a year | $26.28 | $158 |
| Bladeless fan | 40 | 8 hours a day for 5 months a year | $1.84 | $9 |
| Radon fan | 70 | 24 hours a day | $9.20 | $110 |
| Box fan | 75 | 8 hours a day for 5 months a year | $3.29 | $16 |
| Window fan | 60 | 8 hours a day for 5 months a year | $2.63 | $13 |
Head-to-head comparisons
Frequently asked questions
How much does it cost to run a large room HEPA air purifier per hour?
A large room HEPA air purifier drawing 70 watts uses 0.07 kWh per hour. At the U.S. average of 17.99¢/kWh that's 1.3¢ per hour. In North Dakota (12.32¢) it's 0.9¢. In Hawaii (43.51¢) it's 3.0¢.
How much does it cost to run a large room HEPA air purifier per month?
At typical use (24 hours a day), a large room HEPA air purifier costs about $9.20 a month and $110 a year, at the U.S. average rate. Enter your ZIP in the calculator above for your utility's rate.
How many watts does a large room HEPA air purifier use?
Most large room HEPA air purifiers use 30 to 150 watts, depending on the setting (low 15 W, medium 35 W, high 70 W). Plugged in but off, it still draws about 1 W of standby power. Check the label on the back or bottom for your model's exact rating.
How many kWh does a large room HEPA air purifier use?
About 1.68 kWh a day and 614 kWh a year at typical use (24 hours a day).
Does a large room HEPA air purifier use a lot of electricity?
It's a moderate load: 614 kWh a year is about 6% of the average U.S. home's yearly use.
Is it cheaper to run a large room HEPA air purifier or an air purifier?
At typical use, a large room HEPA air purifier costs about $110 a year versus $63 for an air purifier. So the air purifier is cheaper by about $47 a year. Use the comparison table above to compare them at your own settings.
How can I lower the cost of running a large room HEPA air purifier?
- Use Auto mode; on high continuously it can cost 3-5 times as much as Auto.
- Keep doors open between rooms it serves, or close them and move it to where you are.
- Vacuum the pre-filter monthly and replace HEPA filters on schedule.
Rates updated 2026-10-21: EIA data through July 2026. Typical wattage and usage reviewed against DOE, ENERGY STAR and manufacturer specs. Methodology.