Replacing a radon fan costs around $200–$350 including parts and labor, according to EPA guidance updated June 23, 2026. Treat that figure as a starting point for a like-for-like fan replacement, not a guaranteed local price.
What a straightforward replacement usually involves
A technician should confirm that the fan has failed, select a replacement suited to the existing system, disconnect and remove the old unit, install the new fan, and check the system indicator. The quote should say whether it includes disposal, new couplings, electrical work, and a radon test.
Fan selection is not based on pipe diameter alone. The existing system’s pressure and airflow requirements matter. Installing a fan that is too small may not maintain the needed suction, while an unnecessarily large fan can add noise and energy use.
When the bill can exceed the basic range
- The electrical outlet, disconnect, wiring, or weatherproof connection needs repair.
- The old fan is in a difficult attic, roof, or exterior location.
- Brittle pipe, failed rubber couplings, loose supports, or vibration problems need correction.
- Condensate has collected in the pipe or damaged the fan.
- The original fan was poorly sized and the contractor must diagnose the system before choosing a replacement.
- Radon remained elevated before the fan failed, suggesting that the system needs redesign rather than a simple swap.
Repair, replacement, or redesign?
| Situation | Likely next step |
|---|---|
| Fan stopped, but the system previously kept radon low | Diagnose and replace the fan with a properly matched unit |
| Fan runs but the system indicator changed | Check pipe blockage, leaks, couplings, condensate, and fan performance |
| Radon stayed high while the old fan was operating | Reassess the system design, suction points, and foundation zones |
| System was altered during remodeling | Inspect the complete system and retest before choosing equipment |
How long does a radon fan last?
The EPA says fans may last five years or more and notes that manufacturer warranties tend not to exceed five years. Service life varies with the equipment, installation, weather exposure, moisture, operating pressure, and electrical conditions. A fan running beyond its warranty is not automatically defective, but the warning device should still be checked regularly.
Retest after the work
A running fan and a normal pressure indicator show that the system is operating; they do not measure the radon concentration in the home. Confirm performance with a radon test after repairs. The EPA also advises retesting at least every two years to make sure levels remain low.
Questions to ask before approving the quote
- Is this a direct replacement or is the proposed fan capacity changing?
- What diagnosis showed that the fan, rather than another system component, failed?
- Are couplings, electrical work, labor, disposal, and testing included?
- What parts and labor warranties apply?
- What should the system pressure indicator show after the repair?
Source
The price, service-life, maintenance, and retesting guidance comes from the EPA page How do I know if my radon mitigation system is working properly?, last updated June 23, 2026.