Guide
Radon Fan Replacement Cost: What to Expect
Updated
Replacing a radon mitigation fan alone, nationally, runs about $200 to $600, averaging around $350 (Angi, updated 2026-03-18). That's for the fan itself; a full new mitigation system, piping included, runs higher. A fan swap only fixes the problem if the rest of the system (the vent piping and seal) is still sound.
Signs a mitigation fan has failed
A radon fan runs continuously once installed, so it's easy to stop noticing it is there, which is exactly how a failure goes unnoticed. Signs include the fan going unusually quiet (fans do fail silently), a U-tube manometer gauge reading that has changed from its baseline, visible wear or a burning smell near the fan housing, or a retest coming back higher than the system's original post-installation number.
What drives the price
Fan size (measured in cubic feet per minute) and system complexity are the main factors; a multi-fan setup or a harder-to-access fan location costs more than a single standard fan swap. National pricing from Angi puts the typical range at $200 to $600, averaging about $350, though permit fees (up to roughly $150 in some jurisdictions) and a follow-up radon test add to the total project cost.
Why the installer being licensed still matters
Illinois's Radon Industry Licensing Act (420 ILCS 44/) covers radon mitigation work generally, which includes fan replacement on an existing system, not just new installs. The same verification logic applies: check a contractor's license before hiring them for a fan swap, the same as for a full system.
Confirming the swap actually worked
A new fan running is not proof radon levels are back down. The only way to know is a test placed after the replacement, with the system operating normally, the same confirmation step that applies after any mitigation work.
Quick answers
FAQ
How long do radon mitigation fans typically last?
Fans are mechanical parts and wear out over years of continuous operation; exact lifespan varies by model and manufacturer, which is why periodic retesting matters even for a system installed correctly years ago.
Can I tell a fan has failed just by looking at it?
Not reliably. Some fans fail quietly with no obvious visual sign. A manometer reading change or a retest is a more reliable check than a visual inspection alone.
Is fan replacement cheaper than a new full system?
Generally yes, since the existing vent piping and seal are reused. A full system install (piping plus fan) runs the higher range covered on the cost page, while a fan-only swap is the smaller national range above.
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