What does a radon mitigation fan cost to run?

Run the numbers on your own use

Change any of these and the figures update. The defaults are the typical case described above; your rate is the input that moves the answer most.

Why this is lower than the number you will see elsewhere

Almost every published answer to this question multiplies the rating on the label by the hours the appliance is switched on. For a radon mitigation fan that gives 526 kWh a year, or $96.

Continuous by design and by regulation. A radon system that cycles is not doing its job.

The arithmetic, step by step

Nothing here is hidden, so you can check it or change it. Working in the order the formula runs:

1. 60 W — what it draws while it is actually drawing. This is the rating on the plate.
2. × 100% — the share of its in-service time it is really pulling that. Continuous by design and by regulation. A radon system that cycles is not doing its job.
   That gives 60 W averaged across the hours it is on.
3. × 24 hours a day × 365 days — A typical sub-slab depressurisation fan running as installed.
   60 × 24 × 365 ÷ 1,000 = 526 kWh a year.
4. × 18.34¢ — the US average residential rate for June 2026.
   526 kWh × 18.34¢ = $96 a year.

Change any assumption in the calculator above and every figure on this page moves with it. The two that matter most are your rate, which varies 4× across the country, and the hours — the duty cycle is a property of the appliance, but the hours are a property of you.

How sensitive is that number?

A single figure invites more confidence than it deserves. Here is the same appliance under assumptions either side of the default, so you can see how much of the answer is the appliance and how much is the guess about how you use it.

Everything else held at the default. The spread here is the honest error bar on the headline figure.

What it costs per hour, day and month

At 18.34¢ per kWh, the US residential average for June 2026.

The thing worth knowing

This runs 8,760 hours a year, is never switched off, and sits in an attic or on an outside wall where nobody looks at it. It is a textbook hidden load — and unlike most of them it should not be switched off, since it is the thing keeping a carcinogen out of the house. What varies enormously is fan sizing: an installer who fitted a 140 W fan where a 20 W one would hold the same pressure has committed you to roughly two hundred dollars a year, forever.

What it costs in your state

The appliance is the same everywhere; the rate is not. Running this radon mitigation fan costs $277 a year in Hawaii and $69 in Nevada — a difference of 4×.

Cost of running one radon mitigation fan for a year, by state. Residential average price, EIA June 2026.

Other tools, hobbies and outdoors costs

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• Pottery kiln

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  A medium studio kiln fired roughly twice a month to cone 6.

• Electric fireplace

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• Home server or NAS

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  A four-bay NAS running continuously.

• Electric sauna heater

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  A 4–6 person home sauna, used a couple of times a week.

Questions

Source: U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A, June 2026. U.S. Government work, public domain.

How every figure on this page is computed · Where the data comes from