How much does it cost to run a radon mitigation fan?
A radon mitigation fan drawing 75 watts, running around the clock, uses about 1.80 kWh per day and costs about $0.35 per day, $10.64 per month, and $127.52 per year at the US average residential rate of 19.4¢/kWh. Enter your own wattage, hours, and state below for an exact figure.
Estimates only — based on typical wattages and average state rates, not your actual bill.
What drives the cost
A radon fan is designed to run continuously, every hour of every year, which is exactly why its modest wattage adds up to a real annual number. At 75 watts it draws less than a light bulb, but 8,760 hours a year is the most run time of anything in a house. Turning it off is not a savings strategy — it is a safety system.
Cost at different daily usage
Same radon mitigation fan at 75 watts, run for different amounts of time, at 19.4¢/kWh.
| Usage | kWh/day | Per day | Per month | Per year |
|---|---|---|---|---|
| 6 h/day | 0.45 kWh | $0.09 | $2.66 | $31.88 |
| 12 h/day | 0.90 kWh | $0.17 | $5.32 | $63.76 |
| 18 h/day | 1.35 kWh | $0.26 | $7.98 | $95.64 |
| 24 h/day | 1.80 kWh | $0.35 | $10.64 | $127.52 |
Cost by model power draw
Not all models are equal. At 24 h/day, here is what the range costs.
| Model | Power | kWh/day | Per day | Per month |
|---|---|---|---|---|
| Low-draw model | 40 W | 0.96 kWh | $0.19 | $5.67 |
| Typical | 75 W | 1.80 kWh | $0.35 | $10.64 |
| High-draw model | 150 W | 3.60 kWh | $0.70 | $21.27 |
Cost by state
A radon mitigation fan at 75 W for 24 h/day, priced at each state's average residential rate.
| State | Rate | Per day | Per month | Per year |
|---|---|---|---|---|
| Alabama | 16.8¢ | $0.30 | $9.19 | $110.18 |
| Alaska | 28.2¢ | $0.51 | $15.47 | $185.47 |
| Arizona | 15.2¢ | $0.27 | $8.34 | $100.06 |
| Arkansas | 14.4¢ | $0.26 | $7.87 | $94.35 |
| California | 33.2¢ | $0.60 | $18.22 | $218.45 |
| Colorado | 16.2¢ | $0.29 | $8.85 | $106.17 |
| Connecticut | 27.4¢ | $0.49 | $15.00 | $179.82 |
| Delaware | 19.4¢ | $0.35 | $10.62 | $127.33 |
| District of Columbia | 25.4¢ | $0.46 | $13.92 | $166.88 |
| Florida | 15.2¢ | $0.27 | $8.31 | $99.67 |
| Georgia | 15.8¢ | $0.29 | $8.68 | $104.07 |
| Hawaii | 52.0¢ | $0.94 | $28.49 | $341.64 |
| Idaho | 12.3¢ | $0.22 | $6.77 | $81.14 |
| Illinois | 23.9¢ | $0.43 | $13.07 | $156.69 |
| Indiana | 18.1¢ | $0.33 | $9.94 | $119.25 |
| Iowa | 14.1¢ | $0.25 | $7.75 | $92.90 |
| Kansas | 15.1¢ | $0.27 | $8.29 | $99.40 |
| Kentucky | 15.0¢ | $0.27 | $8.21 | $98.42 |
| Louisiana | 14.2¢ | $0.25 | $7.75 | $92.97 |
| Maine | 28.6¢ | $0.52 | $15.69 | $188.10 |
| Maryland | 21.8¢ | $0.39 | $11.93 | $143.03 |
| Massachusetts | 28.8¢ | $0.52 | $15.79 | $189.35 |
| Michigan | 22.0¢ | $0.40 | $12.06 | $144.61 |
| Minnesota | 16.9¢ | $0.31 | $9.29 | $111.36 |
| Mississippi | 16.2¢ | $0.29 | $8.85 | $106.17 |
| Missouri | 13.7¢ | $0.25 | $7.50 | $89.88 |
| Montana | 14.7¢ | $0.26 | $8.04 | $96.38 |
| Nebraska | 13.6¢ | $0.24 | $7.45 | $89.29 |
| Nevada | 13.6¢ | $0.24 | $7.45 | $89.35 |
| New Hampshire | 27.3¢ | $0.49 | $14.97 | $179.56 |
| New Jersey | 23.3¢ | $0.42 | $12.75 | $152.88 |
| New Mexico | 14.1¢ | $0.25 | $7.74 | $92.77 |
| New York | 29.9¢ | $0.54 | $16.40 | $196.64 |
| North Carolina | 15.1¢ | $0.27 | $8.27 | $99.14 |
| North Dakota | 13.6¢ | $0.24 | $7.46 | $89.42 |
| Ohio | 19.5¢ | $0.35 | $10.70 | $128.25 |
| Oklahoma | 13.4¢ | $0.24 | $7.33 | $87.91 |
| Oregon | 16.3¢ | $0.29 | $8.91 | $106.89 |
| Pennsylvania | 21.6¢ | $0.39 | $11.81 | $141.58 |
| Rhode Island | 29.5¢ | $0.53 | $16.14 | $193.55 |
| South Carolina | 16.2¢ | $0.29 | $8.87 | $106.30 |
| South Dakota | 15.7¢ | $0.28 | $8.62 | $103.35 |
| Tennessee | 14.5¢ | $0.26 | $7.93 | $95.07 |
| Texas | 16.4¢ | $0.30 | $9.01 | $108.01 |
| Utah | 13.0¢ | $0.23 | $7.10 | $85.15 |
| Vermont | 24.9¢ | $0.45 | $13.64 | $163.53 |
| Virginia | 17.6¢ | $0.32 | $9.65 | $115.70 |
| Washington | 14.9¢ | $0.27 | $8.19 | $98.22 |
| West Virginia | 16.8¢ | $0.30 | $9.21 | $110.38 |
| Wisconsin | 19.7¢ | $0.36 | $10.82 | $129.69 |
| Wyoming | 14.8¢ | $0.27 | $8.11 | $97.24 |
How to cut the cost
- Do not switch it off to save money; radon mitigation only works when the fan runs continuously.
- If replacing a failed fan, choose a correctly sized model — an oversized fan wastes power without lowering radon further.
- Check the manometer periodically; a fan working against a blocked pipe uses power without moving air.
- Seal foundation cracks and the sump lid so the system can do its job with less airflow.
Compare with related appliances
Monthly cost at typical usage and 19.4¢/kWh.
Questions
Should I turn my radon fan off at night to save money?
No. Radon levels rebuild quickly when the fan stops, and the system is designed for continuous operation. The running cost is modest compared with the health reason it exists.
How much does a radon fan cost to run per year?
At 75 watts running continuously, roughly 657 kWh a year. The table below shows what that costs at your state's rate.
How do you calculate what a radon mitigation fan costs to run?
Multiply its wattage by the hours it runs per day, divide by 1,000 to get kilowatt-hours, then multiply by your electricity rate. For a radon mitigation fan: 75 W × 24 h ÷ 1,000 = 1.80 kWh per day, which at 19.4¢/kWh is $0.35 per day.
How many watts does a radon mitigation fan use?
Typically 75 watts, with most models falling between 40 and 150 watts. The label on the appliance or its power supply gives the figure for your specific unit.