Replacing a radon fan costs $250 to $650 professionally installed in most homes, averaging around $400 to $450 once labor is included. The fan unit alone runs $150 to $400 depending on airflow rating and brand. If your fan is more than five years old and running loud, weak, or not at all, a straight fan replacement, not a whole new system, is almost always the fix. Call (414) 455-7279 for a quote based on your home.
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Radon Fan Replacement Cost at a Glance
Here’s how a typical fan-only replacement breaks down for a Milwaukee-area home:
| Item | Typical Cost |
| Fan unit only (if you’re reinstalling yourself) | $150 – $400 |
| Professional fan replacement, fully installed | $250 – $650 |
| Average total for most single-family homes | ≈ $400 |
| Electrical circuit upgrade (older homes only) | $150 – $300 |
| Local permit, where required | $25 – $150 |
| Post-replacement radon retest | $100 – $250 |
These ranges line up with what Angi report nationally for a fan-only swap. Because the pipe, roof penetration, and vent routing already exist, a replacement is one of the least expensive parts of owning a mitigation system.
What Actually Drives the Radon Fan Replacement Cost
A handful of factors move the price up or down for your specific home:
- Airflow capacity (CFM). Higher-CFM fans cost more but move more air, which matters in larger homes or homes with higher radon readings.
- Fan type. Standard inline fans are the least expensive. Low-profile and dual-stage models cost more but run quieter or handle bigger systems.
- Brand. Recognized names like RadonAway and Fantech carry a premium over generic replacements, but they’re also the fans most warranties and manufacturers stand behind.
- Access and vent location. A fan in an attic or a tight crawlspace takes longer to swap than one mounted in an open exterior wall, which adds labor time.
- Electrical work. Older homes without a dedicated circuit for the fan sometimes need new wiring, which adds to the total.
- Permits and retesting. Some municipalities require a permit and a follow-up radon test after the work is done.
Radon Fan Replacement vs. a Brand New Mitigation System
These two get confused constantly, and it’s an easy way to overpay. A complete new radon mitigation system, including the suction pipe, sealing, roof penetration, and the fan itself, averages $1,028, with most homeowners paying between $786 and $1,274, according to HomeAdvisor. A fan replacement reuses all of that existing infrastructure and only swaps the fan itself, which is why it should land well under half that price.
If a contractor quotes you close to full-system pricing for what you were told is “just a fan replacement,” get a second opinion. Our radon system repair and fan replacement team can tell you over the phone whether your home needs a fan swap or something more.
How Much Electricity Does a Radon Fan Use?
An active radon fan draws about 100 to 300 watts continuously, since it runs 24 hours a day. That works out to roughly 876 kWh a year, adding an estimated $30 to $300 annually to your electric bill depending on your fan’s draw and your local rate, per HomeAdvisor.
Milwaukee’s average residential electricity rate is about 18 cents per kWh. At that rate, a typical single-fan system running continuously costs roughly $150 to $160 a year to operate, closer to the lower end of the national range. A fan that’s suddenly pulling noticeably more power, or running hot to the touch, is often a sign it’s wearing out and worth having checked before it fails completely.
Signs Your Radon Fan Needs Replacing, Not Just Repairing
A fan is usually the culprit when you notice:
- A radon retest that comes back above 4 pCi/L after a system that previously tested clean
- A new grinding, humming, or rattling noise from the fan housing
- The fan has stopped spinning or you can’t hear it running at all
- The fan is more than 5 to 10 years old, which is the typical service life for an active unit
For a full breakdown of how to tell the difference between a fan that needs replacing and a system issue, see our guide on when to replace a radon fan. If the noise itself is the main issue and the fan is otherwise working, check why your radon fan is so loud first, since some noise problems are a mounting fix rather than a full replacement.
DIY Radon Fan Replacement: Is It Worth the Risk?
Swapping the fan yourself can save the labor portion of the cost, roughly $100 to $250, but it comes with real trade-offs:
- Sizing matters. A fan with the wrong CFM rating for your home’s soil conditions can leave radon levels above the EPA’s 4 pCi/L action level even though the system looks like it’s running.
- Warranties are strict. Most manufacturers void the warranty if a certified installer didn’t do the work.
- A retest is non-negotiable either way. Whoever does the swap, plan on a short-term radon test afterward to confirm the new fan is actually pulling levels back down.
If you’re comfortable with basic electrical work and PVC connections, DIY is possible. If you want documented proof the system is working, which matters at resale, professional installation is the safer call.
Radon Fan Replacement Cost in Milwaukee and Southeastern Wisconsin
Wisconsin’s clay-heavy soils and long heating season mean radon fans here often run closer to continuously than in milder climates, which is part of why the electricity math above matters more locally than it does nationally. Homes across our Milwaukee service area, including Bayside, Brookfield, Fox Point, Mequon, Wauwatosa, and West Allis, see fairly similar pricing, since most of southeastern Wisconsin sits in the same labor market.
Some Milwaukee-area municipalities require an electrical permit for hardwired fan work. Confirm with your local building department, or ask our team when you call, we handle permitting on every job we quote.
Get an Exact Quote for Your Radon Fan Replacement
Every home’s vent routing, fan age, and access point are a little different, and that’s what actually decides your final number. For a firm quote, our radon system repair and fan replacement team can typically diagnose the issue and give you a price over the phone. Call (414) 455-7279 or request a free quote online, and if your fan turns out to be part of a bigger issue, we’ll walk you through what a full radon mitigation system would look like instead.
FAQ’s
Is it cheaper to replace just the fan or install a whole new radon system?
Replacing just the fan is almost always cheaper, typically $250 to $650 versus roughly $1,028 on average for a complete new system. A fan-only replacement only makes sense if the rest of your system, the pipe, seals, and roof vent, is still in good shape. If your system is more than 15 to 20 years old, a technician may recommend inspecting the whole setup before you pay to replace just the fan.
How much does a radon fan add to my electric bill each year?
Around $30 to $300 a year nationally, and closer to $150 to $160 a year at Milwaukee’s average electricity rate, based on a fan running continuously at 100 to 300 watts. A fan pulling noticeably more than usual is often a sign it’s starting to fail.
How long does a radon fan typically last before it needs replacing?
Most active radon fans last 5 to 10 years. Passive systems with no fan at all can go longer since there’s no motor to wear out, but they’re also less effective at pulling radon levels down in homes with higher readings.
Can I replace a radon fan myself to save money?
You can, and it saves roughly $100 to $250 in labor, but sizing the fan correctly and sealing every connection matters for whether the system actually works. Most manufacturers also void the fan’s warranty if it wasn’t installed by a certified technician, and you’ll still need a radon retest afterward either way.
Do I need a permit to replace a radon fan in Wisconsin?
Some Milwaukee-area municipalities require an electrical permit for hardwired fan replacement, typically $25 to $150. Requirements vary by city, so check with your local building department or ask your contractor to confirm and pull it as part of the job.
Will a replacement fan be louder or quieter than my old one?
Usually quieter. A fan that’s been getting louder over time is often already failing, and newer models in the same CFM class tend to run quieter than fans from 5 to 10 years ago. If noise is your main complaint and the fan is still pulling radon levels down, see our guide on why a radon fan gets loud before assuming you need a full replacement.
Final Thoughts
Understanding the components that make up the radon fan cost, the associated radon fan installation cost, and the inevitable radon fan replacement cost empowers you to make a financially sound decision without sacrificing safety. Whether you choose a DIY route or hire a certified professional, the goal remains the same: keep radon levels well below the EPA limit and protect your family’s health.
If you are ready to take the next step, call 414‑455‑7279 today. A licensed specialist will assess your home, provide a transparent estimate, and guide you through the entire mitigation process from initial testing to final certification.
