What Is an Active Radon Monitor?
There are two types of radon detectors. Most hardware stores sell passive test kits — a small charcoal canister you leave out for 48–96 hours, then mail to a lab. You get one reading, from one period of time, weeks after you started the test.
An active radon monitor is fundamentally different. It reads your radon levels continuously — every hour, around the clock — and displays your current level, your short-term average, and your long-term average on a digital screen. Some models connect to an app so you can check levels from anywhere.
📊 Continuous Readings
Hourly measurements, not a one-time snapshot. You see how radon fluctuates with weather, seasons, and ventilation — and you see exactly what your mitigation system is doing.
✅ Post-Install Confirmation
Know your system is working every day — not just at the post-install test. If levels ever rise again (fan failure, crack opening), you'll know immediately instead of months later.
🏡 Real-World Data
Radon levels change. Winter readings run 30–50% higher than summer in Maine. An active monitor shows your actual exposure year-round, not just one seasonal snapshot.
📋 Documentation
If you ever sell your home, months of continuous radon data from a certified device is far more compelling to buyers than a single short-term test result.
| Feature | Passive Test Kit | Active Radon Monitor ✓ |
|---|---|---|
| Reading frequency | One result, one time | Every hour, continuously |
| Turnaround | 2–4 weeks (lab analysis) | Instant display |
| Seasonal variation | Misses it | Captures it |
| Ongoing monitoring | None | Permanent |
| Typical retail cost | $15–$40 | $150–$199 |
| Included with your install | — | Free — $0 |
Why We Include It
We want every home we mitigate to stay protected — not just pass an inspection. Radon fans can fail, new cracks can open, pressure dynamics can change. A passive test kit sitting in a drawer won't catch any of that. A continuous active monitor will.
Including the monitor isn't just a bonus — it's how we make sure our work keeps working for you. Every installation we do is backed by a monitor on the wall, giving you live confirmation that your family's air is safe.