Radon Fan Operating Cost Calculator
A radon mitigation fan runs around the clock, so its electricity use is a real but small part of owning a system. This calculator estimates that running cost, the monthly and yearly electricity, from two numbers: the fan's wattage and your electricity rate. It does not price the fan itself; if you are looking for what a fan costs to buy or replace, see the section below.
Most radon fans use 60–85 W.
Sets a starting rate below.
Use your bill for accuracy.
Monthly electricity cost
$5.62
Annual electricity cost
$67.45
Energy use / year
613.2 kWh
Electricity only: this does not include the cost of buying, installing, or replacing the fan. Assumes continuous operation (24 hours/day, 365 days/year). Estimates only: your actual cost depends on your fan and utility rate.
Running Cost vs. What the Fan Itself Costs
These are two different numbers, and this calculator answers only the first. The running cost is the electricity a fan uses while it operates, which is what the tool above estimates, typically a few dollars a month. The purchase cost is what the hardware and labor run: the radon fan unit itself is generally about $150 to $400 depending on the model and the suction your system needs, and a full fan replacement usually lands around $300 to $600 installed, because the existing pipe and routing are reused. A complete new mitigation system is a separate figure again. Use the links below if the price of the fan, rather than the cost of running it, is what brought you here.
How to Use the Calculator
Enter your radon fan's wattage. Most residential radon fans draw between 60 and 85 watts, and the rating is usually printed on the fan housing or in its manual. Then choose your region for an average electricity rate, or type your exact rate from a recent utility bill (in dollars per kilowatt-hour) for a more precise estimate. The monthly and annual cost update instantly. The calculator assumes the fan runs continuously, 24 hours a day, 365 days a year, which is how radon mitigation systems are designed to operate.
How Radon Fan Energy Use Is Calculated
Electricity use is straightforward: energy (kilowatt-hours) = watts × hours ÷ 1,000. Because a radon fan runs continuously, that is watts × 24 × 365 ÷ 1,000. A typical 70-watt fan therefore uses about 613 kilowatt-hours per year. Multiplying that by your electricity rate gives the annual cost, and dividing by twelve gives the monthly cost. At a South-region average of about $0.11 per kilowatt-hour, a 70-watt fan costs roughly $67 per year, or about $5.62 per month.
What It Costs to Run a Radon Fan by Region
Because the only variable beyond wattage is your electricity rate, operating cost tracks closely with where you live. Using a 70-watt fan as the example: at a South average near $0.11/kWh the cost is about $67 per year; in the Midwest near $0.13/kWh about $80; in the West near $0.14/kWh about $86; and in the higher-rate Northeast near $0.20/kWh about $123 per year. Your actual rate is the most accurate input, so use the custom field with the figure from your bill when you can.
Ways to Lower Your Radon Fan Operating Cost
The biggest lever is fan sizing: a correctly sized system uses the smallest fan that still holds radon below the action level, so an over-powered fan wastes electricity for no benefit. Which fan that is depends on what sits under your slab and how your pipe is routed, and our fan sizing calculator works through it. Beyond that, energy-efficient fan models, a well-sealed sub-slab or sub-membrane system, and good pipe routing all reduce the work the fan has to do. Turning the fan off to save money is not recommended. Radon levels climb back up within hours, undoing the protection the system provides. The operating cost is small relative to the health benefit of keeping radon low.
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Common Questions
How much electricity does a radon fan use?
A typical radon fan draws about 50 to 150 watts and runs continuously. Most residential fans are around 70 watts, which works out to roughly 600 to 615 kilowatt-hours per year, comparable to leaving a couple of LED bulbs on around the clock.
How much does it cost per month to run a radon mitigation fan?
For a typical 70-watt fan, expect about $5 to $10 per month depending on your electricity rate. At a South-region average of about $0.11 per kilowatt-hour the monthly cost is roughly $5.62; in higher-rate regions it can reach $10 or more. Use the calculator with your own rate for a precise figure.
Do radon fans run constantly?
Yes. Radon mitigation fans are designed to run 24 hours a day, every day. Continuous operation keeps the soil beneath the home under constant suction so radon is drawn out before it can enter living space. The calculator assumes this 24/7 runtime.
Does this calculator tell me what a radon fan costs to buy?
No. This calculator estimates the electricity cost of running a fan that is already installed. What the hardware costs is a separate question: the fan unit itself is generally about $150 to $400, and a full replacement runs about $300 to $600 installed. Our radon fan replacement cost guide covers that side in detail.
Radon fan replacement cost →How much does it cost to replace a radon fan?
Most radon fans last about 5 to 10 years. When one wears out, only the fan is replaced (the pipe and routing stay in place), so a replacement is typically about $300 to $600 installed rather than the cost of a whole new system.
Should I turn my radon fan off to save money?
No. Operating cost is only a few dollars a month, and radon levels rise again within hours of switching the fan off. Leaving the system running continuously is what keeps your indoor radon below the EPA action level, so the small electricity cost is well worth it.