Airthings Corentium Home 2: Canadian Buying Guide

The Airthings Corentium Home 2 is the current version of the most widely sold radon monitor in Canada. It keeps the same alpha spectrometry sensor and on-device display as the original, and adds Bluetooth, a temperature sensor and a humidity sensor. It retails around $250 CAD, roughly $60 to $70 more than the original model, which Airthings still sells.

The short answer: buy the Home 2 if you want radon history on your phone or you are testing a basement where damp matters. Buy the original if you want the cheapest device that was independently tested by Canada's certification body.

That last point is the one most buying guides miss, so it is worth explaining properly.

What actually changed from the original

The sensor did not. Both models use alpha spectrometry, which is the detection method used in professional equipment, and Airthings quotes the same accuracy figure for both.

What the Home 2 adds:

• Bluetooth Low Energy, so readings sync to the Airthings app and you get graphs over time instead of just the numbers currently on the screen
• A temperature sensor, sampling every five minutes
• A humidity sensor, which matters more than it sounds in a Canadian basement
• Airthings SmartLink compatibility, for people already in that ecosystem

What stays the same: it runs on batteries, it shows readings on the device without needing a phone, and the measurement range is 0 to 9999 Bq/m³, which is far beyond anything you will see in a home.

Why the humidity sensor is not a gimmick

Radon monitors are almost always placed in basements, and basements are where humidity problems live. Two reasons that reading earns its place.

First, damp basements grow mould, and if you are already monitoring air quality down there, humidity is the other number worth knowing.

Second, and more interestingly, humidity appears to affect radon monitor accuracy. The C-NRPP 2024/25 performance report ran one of its four test rounds at 70% relative humidity to approximate a Canadian summer basement, and that round was where device grades slipped compared with the drier rounds. Knowing your basement is sitting at 70% RH tells you something about how much to trust a short-term reading.

The C-NRPP testing point

This is where the Home 2 gets complicated, and where we differ from most guides.

C-NRPP is Health Canada's designated body for radon measurement. In its 2024/25 round it put six consumer monitors through four sets of chamber conditions at the Radiation Safety Institute of Canada. The device it tested is the original Corentium Home, not the Home 2.

That is not a mark against the Home 2. The sensor is the same and there is no reason to expect it to perform differently. But if you specifically want a device with independent Canadian lab results behind it, the tested one is the original.

For what it is worth, C-NRPP concluded that every device in that round "demonstrated acceptable performance to be recommended by C-NRPP (an average performance grade of B or better)". This is not a category where you can buy badly.

There is also a limit worth understanding before you spend anything. C-NRPP states plainly that consumer monitors "cannot be professionally calibrated and are not approved by C-NRPP for use by radon measurement professionals". A monitor tells you whether you have a problem. It does not produce a measurement anyone will accept for a real estate transaction or post-mitigation sign-off. For that you need a certified professional.

What it costs, and the honest comparison

At around $250 for the Home 2 against roughly $180 for the original, you are paying about $70 for Bluetooth, temperature and humidity.

Worth it if:

• You want to see radon rise and fall over weeks rather than reading a screen
• You are testing a basement and want the humidity number
• You plan to confirm that a mitigation system is working, where the trend line is the whole point

Not worth it if:

• You want one clear answer about whether your home is above 200 Bq/m³
• You are not going to install another app
• You want the device with published Canadian lab results

Check the current Corentium Home 2 price on Amazon.ca

How long you need to run it

Airthings quotes ±10% after seven days and ±5% after two months, and the first reading takes 24 hours. Those numbers describe the device. They do not describe your house.

Radon swings enormously day to day with weather, ground moisture and whether your windows are open. C-NRPP recommends leaving a monitor in place for at least three months, ideally through the heating season when indoor levels run highest, and making decisions on the long-term average rather than anything the screen showed on a given Tuesday.

If you buy a Home 2 in July, get a low reading in week one and conclude you are fine, you have learned very little. Our guide to interpreting your radon test results covers what the numbers actually mean.

Should you buy a monitor at all?

If you have never tested your home, a monitor may not be the right first purchase. A mail-in alpha track kit costs $30 to $60 and gives you a lab-analysed long-term average, which is exactly the number Health Canada guidance is built around. It answers "do I have a problem" for a fifth of the price.

A digital monitor earns its money when you want to watch levels over time, confirm mitigation worked, or keep an eye on things permanently. Both approaches are compared in our DIY testing versus hiring a professional guide, and there is a wider product comparison on our DIY testing page.

Where it sits against everything else

The Corentium Home line is the default recommendation in Canada for good reason: it is battery-powered, it needs no app, it is widely stocked, and it is among the cheapest tested devices. The Home 2 is that same device with more information available.

If accuracy is your priority rather than convenience, the Aranet RN+ has a tighter published specification at ±8%. If you want the fastest useful reading, the Ecosense models reach their stated accuracy in about ten hours rather than seven days.

Our full comparison of every option, including the independent test conditions, is in Best Radon Detectors in Canada 2026.

Whatever you buy, Health Canada's guidance is the same: act on a long-term average above 200 Bq/m³, and the higher the reading, the sooner you should act.