How much does it cost to run a radon fan?
A radon fan 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. Radon mitigation fans run 24/7 and typically draw 20-150 W, or roughly 175-1,300 kWh a year.
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Cost by setting
| Setting | Watts | Per hour | Per day | Per month | Per year |
|---|---|---|---|---|---|
| RP140 (low) | 20 | 0.4¢ | 8.6¢ | $2.63 | $32 |
| RP145 (mid) | 70 | 1.3¢ | 30¢ | $9.20 | $110 |
| GP501 (high suction) | 140 | 2.5¢ | 60¢ | $18.40 | $221 |
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 | 0.07 | 1.3¢ | $0.38 | $5 |
| 2 hours | 0.14 | 2.5¢ | $0.77 | $9 |
| 4 hours | 0.28 | 5.0¢ | $1.53 | $18 |
| 8 hours | 0.56 | 10¢ | $3.07 | $37 |
| 12 hours | 0.84 | 15¢ | $4.60 | $55 |
| 24 hours | 1.68 | 30¢ | $9.20 | $110 |
Cost to run a radon fan in every state
The same radon fan 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 |
How to cut the cost
- Never turn it off to save money; radon levels rebound within hours.
- Ask your mitigator whether a smaller fan (20-50 W) reaches adequate suction for your soil.
- Seal slab cracks and the sump lid so the fan pulls from under the slab, not from your living space.
- Check the manometer monthly to confirm the fan is working.
Cheaper ways to get the job done
Confirms whether a lower-wattage fan still keeps radon below 4 pCi/L.
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Compare with similar appliances
| Appliance | Watts | Typical use | Per month | Per year |
|---|---|---|---|---|
| Radon fan | 70 | 24 hours a day | $9.20 | $110 |
| Bathroom exhaust fan | 15 | 1 hour a day | $0.08 | $1 |
| Dehumidifier | 500 | 24 hours a day for 6 months a year | $26.28 | $158 |
| Air purifier | 40 | 24 hours a day | $5.26 | $63 |
| Large room HEPA air purifier | 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 radon fan per hour?
A radon fan 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 radon fan per month?
At typical use (24 hours a day), a radon fan 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 radon fan use?
Most radon fans use 20 to 150 watts, depending on the setting (rp140 (low) 20 W, rp145 (mid) 70 W, gp501 (high suction) 140 W). Check the label on the back or bottom for your model's exact rating.
How many kWh does a radon fan use?
About 1.68 kWh a day and 614 kWh a year at typical use (24 hours a day).
Does a radon fan 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 radon fan or a bathroom exhaust fan?
At typical use, a radon fan costs about $110 a year versus $1 for a bathroom exhaust fan. So the bathroom exhaust fan is cheaper by about $109 a year. Use the comparison table above to compare them at your own settings.
How can I lower the cost of running a radon fan?
- Never turn it off to save money; radon levels rebound within hours.
- Ask your mitigator whether a smaller fan (20-50 W) reaches adequate suction for your soil.
- Seal slab cracks and the sump lid so the fan pulls from under the slab, not from your living space.
Rates updated 2026-10-21: EIA data through July 2026. Typical wattage and usage reviewed against DOE, ENERGY STAR and manufacturer specs. Methodology.