Updated October 2026
Data from Amazon and official Airthings and Ecobee sites.
2026 verdict
Basement radon does not show up on a thermostat, yet the Ecobee Smart Thermostat Premium is the recommendation on this sheet.
It measures CO2 and TVOC with occupancy, temperature and humidity, puts them on a 4 inch color touchscreen, and reaches Google Home, Alexa, Apple HomeKit, SmartThings and Home Assistant over dual-band Wi-Fi. The Airthings 325 Corentium Home 2 is the monitor that actually measures radon, with hourly samples and 24-hour, 7-day and 30-day averages on an LCD, two AA batteries rated for 3 years, and a 5 year warranty. It also alerts on humidity, which the thermostat does not. Buy the Ecobee Smart Thermostat Premium to tie carbon dioxide to the heating. Buy the Airthings 325 Corentium Home 2 if the gas coming through the slab is the one you need to see.
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| Feature | Airthings 325 Corentium Home 2 | Ecobee Smart Thermostat Premium | Winner |
|---|---|---|---|
| Price | $149.99 | $249.00 | Airthings 325 Corentium Home 2 |
| Warranty | 5 years | 3 years | Airthings 325 Corentium Home 2 |
| Connectivity | Bluetooth, Other | 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth | Ecobee Smart Thermostat Premium |
| Integrations | Google Home, Alexa, Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant | Ecobee Smart Thermostat Premium |
| Sensors | Radon, Temperature, Humidity | TVOC, CO2, Temperature, Humidity, Occupancy | Ecobee Smart Thermostat Premium |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Temperature Alerts, Air Quality Alerts | Airthings 325 Corentium Home 2 |
| Rating | 4.5 | 4.5 | Tie |
| Weather Resistance | NO | NO | Tie |
| Screen | YES | YES | Tie |
What the differences mean
Radon versus room gases
The Airthings 325 Corentium Home 2 measures radon, temperature and humidity, sampling about once an hour and rolling those samples into 24-hour, 7-day, 30-day and long-term averages. The Ecobee Smart Thermostat Premium measures CO2, TVOC, temperature, humidity and occupancy, and it measures no radon at all. A basement test and a stuffy-room test are two different purchases.
Power and placement
The Airthings 325 Corentium Home 2 runs on two AA batteries for about 3 years, so it can sit on a shelf in a basement with no outlet. The Ecobee Smart Thermostat Premium is hardwired into the wall and has no battery. You move the radon meter from room to room. The thermostat stays where the old one was.
How you read it
The Airthings 325 Corentium Home 2 has an LCD with Good, Fair and Poor indicators, plus Bluetooth and Airthings SmartLink if you add a hub for always-on data. It has no Wi-Fi of its own. The Ecobee Smart Thermostat Premium has a 4 inch color touchscreen and stays online on 2.4 GHz and 5 GHz Wi-Fi, so the reading is on the wall and in the apps without walking up to it.
Alerts and warranty
The Airthings 325 Corentium Home 2 alerts on temperature, humidity, air quality and a low battery, and it carries a 5 year warranty. The Ecobee Smart Thermostat Premium alerts on temperature and air quality only, not humidity, and its warranty is 3 years. The extra alerts matter if you want the radon meter to nag you about a damp basement as well as the gas.
Which one to buy if
- the worry is radon in a basement or under a slab
The Airthings 325 Corentium Home 2 is the only one of the two that measures radon, and its battery lets you leave it where the gas collects.
- carbon dioxide should drive the heating system
The Ecobee Smart Thermostat Premium reads CO2 and TVOC on the control that already runs ventilation, and it can tell an occupied room from an empty one.
- you need Apple Home or SmartThings as well as Alexa
The Ecobee Smart Thermostat Premium covers Apple HomeKit, SmartThings, Google Home, Alexa and Home Assistant. The Airthings 325 Corentium Home 2 stops at Google Home, Alexa and Home Assistant.
- the meter has to move between rooms without an outlet
Two AA batteries rated for 3 years power the Airthings 325 Corentium Home 2. The Ecobee Smart Thermostat Premium is hardwired and does not travel.
17% OFF
$149.99
$179.99
- + Price: $149.99
- + Warranty: 5 years
- + Alerts: Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts
- - Connectivity: Bluetooth, Other vs 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth
- - Integrations: Google Home, Alexa, Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant
Winner
$249.00
- + Connectivity: 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant
- + Sensors: TVOC, CO2, Temperature, Humidity, Occupancy
- - Price: $249.00 vs $149.99
- - Warranty: 3 years vs 5 years
What owners say
Owners of the Airthings 325 Corentium Home 2 talk about swapping a one-time test kit for a number that keeps moving with weather, season and ventilation, and about Good, Fair and Poor labels that need no chart to read. Setup and app pairing get called effortless, and several say the readings line up with short-term and long-term kits once the meter has had time to settle. The AA batteries are what let them park it in a basement with no outlet. The complaints are about reach and patience. It is Bluetooth only, so the app is useful when you are nearby rather than from anywhere, it is a trend tool rather than an instant reader, and a couple of owners saw it disagree with a second radon meter.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Airthings 325 Corentium Home 2
- Ecobee Smart Thermostat Premium
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Frequently Asked Questions
Which is better overall: Airthings 325 Corentium Home 2 or Ecobee Smart Thermostat Premium?
The Ecobee Smart Thermostat Premium wins the sheet, because it measures more sensor types, connects more widely and puts CO2 and TVOC on a touchscreen that also runs the heating. The Airthings 325 Corentium Home 2 is the better instrument the moment the pollutant is radon, which the thermostat does not measure.
Does the Ecobee Smart Thermostat Premium detect radon?
No. The Ecobee Smart Thermostat Premium measures CO2, TVOC, temperature, humidity and occupancy, and it has no radon sensor. The Airthings 325 Corentium Home 2 is the radon monitor in this pair, with hourly samples and long-term averages on its own LCD.
What is the biggest difference between the Airthings 325 Corentium Home 2 and the Ecobee Smart Thermostat Premium?
One is a battery radon meter and the other is a thermostat that watches room gases. The Airthings 325 Corentium Home 2 tracks radon, temperature and humidity for about 3 years on two AA cells. The Ecobee Smart Thermostat Premium tracks CO2 and TVOC and can change the heating, but it never sees radon.
Can you check the Airthings 325 Corentium Home 2 from outside the house?
Not on its own. The Airthings 325 Corentium Home 2 is Bluetooth only, with SmartLink if you add an Airthings hub, and it has no Wi-Fi. The Ecobee Smart Thermostat Premium is online over 2.4 GHz and 5 GHz Wi-Fi, so its CO2 and TVOC readings are available remotely. They are still not radon readings.
Who should buy the Airthings 325 Corentium Home 2?
Anyone who wants continuous radon readings they can carry from room to room, with a display, humidity alerts and about 3 years on two AA batteries. It also works with Google Home, Alexa and Home Assistant. It will not measure CO2 or run the heating.
Who should buy the Ecobee Smart Thermostat Premium?
Someone who wants CO2, TVOC and occupancy on the thermostat itself, with Apple HomeKit, SmartThings, Google Home, Alexa and Home Assistant. Do not buy the Ecobee Smart Thermostat Premium as a stand-in for the Airthings 325 Corentium Home 2 if radon is the gas you need.
Full comparison table
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