Radon Fan Cost: When to Replace and How Much You'll Pay
A radon mitigation system has one part that wears out: the fan. Everything else (the pipe, the pit, the seals) can last the life of the house.
So when people ask what radon mitigation costs over time, the real answer is small. You pay once for the system. Then you replace a fan every 10 to 15 years.
This guide gives you the numbers. What a fan costs, when to replace just the fan instead of the whole system, and how to budget for the one moving part you’ll own.
The short version:
- A radon fan runs 10 to 15 years, then it dies. That’s the only recurring cost.
- A replacement fan part runs $200 to $500. Labour to install it runs $150 to $300.
- Most of the time you replace just the fan, not the system. The pipe and pit stay.
- Running the fan costs about $5 to $10 a month in Ontario hydro.
- A handy homeowner can swap a fan alone and save the labour. Many can’t, and that’s fine.
- A quote to “replace the whole system” for a dead fan is almost always a red flag.
What a radon fan costs to replace
You don’t replace a radon system on a schedule. You replace the fan when it fails. Here’s the full cost of that one job.
| Part of the job | Typical cost |
|---|---|
| Fan unit (RadonAway or Fantech) | $200 to $500 |
| Rubber couplings (two of them) | $20 to $40 |
| Clamps and sealant | $15 |
| Labour, about one hour | $150 to $300 |
| Re-test after the swap | $99 to $299 |
If you hire it out and skip the re-test, most Ontario homeowners pay $400 to $700. Add the re-test and it’s $700 to $1,000.
If you do the swap yourself, you pay only for parts. That’s $250 to $500, plus an hour of your time.
The fan price depends on the model. A small home with one suction point uses a cheaper fan than a big home with two. We cover fan sizing in our fan guide.
Repair the fan or replace the system?
This is the question that decides your bill. The answer is almost always “just the fan.”
A dead fan does not mean a dead system. The pipe under your slab, the sealed pit, and the joints can run for decades. The fan is the only part with a motor. So when radon creeps back up, you swap the part that broke. You don’t tear out the whole thing.
Here’s how to tell which job you actually need.
You only need a new fan when:
- The system worked fine for years, then radon rose
- The manometer (the little pressure gauge) dropped or evened out
- The fan is loud, buzzing, or silent
- The pipe and seals look intact
You may need more than a fan when:
- The pipe is cracked or pulled apart at a joint
- The slab seal has failed and you can see gaps
- The original system never got you below 200 Bq/m³
- The house was added onto and now needs a second suction point
A working system that ran 12 years just needs a $400 fan. If an installer wants to replace the whole thing, get a second opinion. The pipe and pit don’t wear out the way a motor does.
Health Canada and the US EPA have backed this same sub-slab method for over 30 years.
Total cost of owning a radon system
Let’s add it up over 30 years, so you can see the real cost of mitigation.
- Install once: $2,800 to $3,800 for a full system
- Fan replacements: two or three over 30 years, at $400 to $700 each
- Electricity: about $5 to $10 a month, so $1,800 to $3,600 over 30 years
- Re-tests: a $99 test every couple of years is smart, but optional
So after the first install, the system costs you roughly $100 to $250 a year to run and maintain. That’s the price of clean indoor air, spread thin.
Compare that to the risk. The Canadian Cancer Society calls radon the leading cause of lung cancer in people who’ve never smoked.
How to know your fan is dying
You won’t smell it. You won’t hear an alarm. The fan gives one quiet signal: the manometer.
The manometer is the small U-shaped tube of red liquid on the pipe near the wall. When the fan runs strong, the two sides of the liquid sit about one to two inches apart. When the fan weakens, they start to even out. When the fan dies, they sit level.
Check it once a month. It takes two seconds.
The warning signs, in the order they show up:
- The manometer reading drops. The fan is losing power.
- The two sides go level. The fan has stopped pulling.
- The fan gets loud. Grinding or buzzing means the bearings are going.
- A re-test reads high. Your home was 75 Bq/m³, now it’s 250. The fan quit somewhere in between.
Some newer fans (the Fantech RN series, the RadonAway GX series) have a built-in alarm or a phone alert. Worth the small extra cost if you know you’ll forget to check the gauge.
When to upgrade instead of match
Most of the time, you replace a dead fan with the same model. But sometimes a bump up makes sense.
Upgrade to a higher-CFM fan if your post-install test was borderline. If your home settled at 150 to 199 Bq/m³ after the first install, a stronger fan can pull it lower. That’s the one case where spending an extra $50 to $100 on the part pays off.
Don’t oversize for no reason. A fan that’s too strong can overdraft your basement. That can pull furnace or fireplace gases backward into the house. If you’re unsure, have a C-NRPP CRMT installer confirm the size is safe before you buy.
The goal isn’t the biggest fan. It’s the right fan for your house, getting you as low as you can reasonably go.
DIY fan swap vs hiring a pro
A fan swap on an existing, working system is one of the few radon jobs a handy homeowner can do alone. The full install is not. Here’s the honest split.
| DIY fan swap | Hire a pro | |
|---|---|---|
| Cost | $250 to $500 (parts) | $400 to $700 |
| Time | 30 to 60 minutes | One visit |
| Skill needed | Basic plumbing, a ladder | None |
| Good for | Working system, dropped manometer | Roof mounts, damaged pipe, Tarion claims |
| Risk if wrong | Radon stays high, leak at a joint | Low |
When DIY makes sense
If your system worked, the manometer dropped, and the fan sits at a reachable height, the swap is straightforward. Cut the power, unclamp the rubber couplings, slide the old fan out, slide the matching new one in, re-clamp, restore power, watch the manometer jump back. We lay out the full step-by-step in our fan guide.
When to hire it out
- The fan is roof-mounted or above a height you’d rather not climb
- The pipe or seals are damaged, not just the fan
- You’re filing a Tarion warranty claim (it requires certified work)
- The job has an electrical fault, not just a dead fan
For most people who own a basic toolkit, the DIY swap saves $200 to $400. For everyone else, paying a pro $400 to $700 is money well spent. There’s no shame in either choice.
Does a Tarion warranty cover the fan?
If you bought a newer home in Ontario, you may not pay for any of this.
Ontario is the only province with radon coverage built into its new home warranty.
That warranty path covers the system, including the fan, up to $50,000. We walk test customers through the Tarion claim process for free.
Outside the warranty window, the fan part usually carries its own 5-year manufacturer warranty from RadonAway or Fantech. After year five, you pay for the part yourself.
Where Breathe Radon Free fits
We’re an Ontario-based testing service, owner-led, based in Guelph and serving the Greater Toronto Area plus surrounding Southern Ontario. We publish our prices and we tell you when you don’t need us.
For fan and system questions:
- If your manometer dropped and you want a clear answer, a $99 test tells you whether your system still works.
- If you’d rather not do the swap yourself, we can refer you to a local C-NRPP CRMT installer.
- If you bought a home with an older system and don’t know its shape, a test is the cheapest first step.
Our published pricing:
- Residential test: $99 flat. 3 to 7 days, written report.
- Real estate test: $399. Faster turnaround for closing timelines.
- Long-term test: $299. 91-day alpha track for ongoing residential.
- Mitigation install: $2,800 to $3,800. Full system, 5-year workmanship warranty.
- Tarion claim help: free for test customers.
The Government of Canada’s plain-English radon overview is a good read if you want the health framing behind any of this. For the bigger price picture, see our Ontario mitigation cost guide.
Book a $99 test to confirm your system still works. Or see full service details.
Frequently asked questions
How often do you replace a radon fan?
Most fans run 10 to 15 years before they fail. Ontario winters are harder on outdoor-mounted fans, so plan toward the lower end. Over a 30-year span, expect to replace the fan two or three times. That’s the only recurring cost of owning a radon system.
Is it cheaper to fix the fan or replace the whole system?
Almost always just the fan. The pipe and pit don’t wear out the way a motor does. A new fan runs $400 to $700 installed. A whole new system runs $2,800 to $3,800. If an installer quotes a full system to fix a dead fan, get a second opinion.
Can I replace a radon fan myself?
Yes, if the system already works and the fan sits at a safe height. The swap takes 30 to 60 minutes and costs $250 to $500 in parts. Cut the power first, match the new fan to your pipe size, and watch the manometer jump back when you restore power. Hire a pro if the fan is on the roof or the pipe is damaged.
How much does it cost to run a radon fan?
About $5 to $10 a month on an Ontario hydro bill, or 60 watts running non-stop. Over a 12-year fan life, that’s roughly $1,000 in electricity. Some newer variable-speed fans cut that running cost in half.
What’s the Canadian guideline for indoor radon?
Health Canada’s action level is 200 Bq/m³.
Book a $99 radon test to check your system →
Authored by the Breathe Radon Free Team. Every claim is backed by a primary source. Full bibliography at /sources.
Ready to test your home?
Get a quote in 60 seconds. Published prices, no sales follow-up.