Updated November 2026
Data from the official Aranet and Ecobee sites.
2026 verdict
If your priority is one wall device that runs the heating and also watches CO2 and TVOC, the Ecobee Smart Thermostat Premium is the pick of this air quality pairing.
It works with Google Home, Alexa, Apple HomeKit, SmartThings and Home Assistant over dual-band Wi-Fi, adds occupancy sensing and a 4 inch colour touchscreen, and carries a 3-year warranty. The Aranet Radon Plus answers a question the Ecobee cannot: it is a radon monitor, tracking radon with temperature, humidity and pressure on an E-Ink screen, running for a rated 7 years on two AA batteries. It is Bluetooth only and reaches a smart home through Home Assistant alone. Choose the Ecobee Smart Thermostat Premium to replace a thermostat and get a read on stale air, and the Aranet Radon Plus when radon in a basement or ground floor is what you need to measure.
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| Feature | Aranet Radon Plus | Ecobee Smart Thermostat Premium | Winner |
|---|---|---|---|
| Price | $209.00 | $239.89 | Aranet Radon Plus |
| Rating | 4.8 | 4.3 | Aranet Radon Plus |
| Warranty | 2 years | 3 years | Ecobee Smart Thermostat Premium |
| Connectivity | Bluetooth | 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth | Ecobee Smart Thermostat Premium |
| Integrations | Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant | Ecobee Smart Thermostat Premium |
| Sensors | Radon, Temperature, Humidity, Atmospheric Pressure | 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 | Aranet Radon Plus |
| Weather Resistance | IP20 | NO | Different strengths |
| Screen | YES | YES | Tie |
| Local Control | YES | YES | Tie |
What the differences mean
What each one measures
The Aranet Radon Plus measures radon, which the thermostat does not track at all. The Ecobee Smart Thermostat Premium measures CO2 and TVOC instead, plus occupancy. Neither senses particulates, so they answer two different questions about the air in your home.
Power and placement
The Ecobee Smart Thermostat Premium is hardwired where your thermostat goes. The Aranet Radon Plus runs on two AA batteries rated for 7 years and weighs 220 g, so it can sit in the basement, the lowest living floor or wherever radon is a concern.
Connectivity and platforms
The Ecobee Smart Thermostat Premium joins 2.4 and 5 GHz Wi-Fi and works with Google Home, Alexa, Apple HomeKit, SmartThings and Home Assistant. The Aranet Radon Plus is Bluetooth only, with Home Assistant as its single smart home route, so remote access needs a Home Assistant setup.
Screen
The Ecobee Smart Thermostat Premium has a 4 inch colour touchscreen for controlling the heating. The Aranet Radon Plus uses a small E-Ink display that shows readings at a glance and helps the batteries last for years.
Warranty
The Ecobee Smart Thermostat Premium carries a 3-year warranty against 2 years for the Aranet Radon Plus.
Which one to buy if
- you are worried about radon in a basement or on the ground floor
The Aranet Radon Plus measures radon and the Ecobee Smart Thermostat Premium does not.
- you are replacing an old thermostat anyway
The Ecobee Smart Thermostat Premium runs the heating and cooling and adds CO2, TVOC and occupancy sensing on the same wall.
- your home runs on Apple Home, Alexa or Google Home
The Ecobee Smart Thermostat Premium works with all three, while the Aranet Radon Plus only reaches Home Assistant.
- there is no outlet or wiring where you need to measure
Two AA batteries rated for 7 years let the Aranet Radon Plus sit anywhere.
$209.00
- + Price: $209.00
- + Rating: 4.8
- + Alerts: Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts
- - Warranty: 2 years vs 3 years
- - Connectivity: Bluetooth vs 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth
Winner
8% OFF
$239.89
$259.99
- + Warranty: 3 years
- + Connectivity: 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant
- - Price: $239.89 vs $209.00
- - Rating: 4.3 vs 4.8
What owners say
Aranet Radon Plus owners lead with speed and accuracy: readings refresh every 10 minutes, and several report that its numbers match the mail-in lab tests they ran alongside it. They like the E-Ink display for being easy on the eyes and on the batteries, the option of using their own rechargeables, and an app that color-codes radon so they can watch levels respond to opening windows or a mitigation system. Home Assistant users single out custom charts and high-radon notifications. The complaints are consistent: it costs more than rival radon monitors, the Bluetooth range is short enough that a basement unit can drop its connection, and there is no cloud sync, so the history lives on the phone that syncs it. Owners also note it needs some time to settle into a good averaged reading.
Frequently Asked Questions
Which is better overall: Aranet Radon Plus or Ecobee Smart Thermostat Premium?
The Ecobee Smart Thermostat Premium, for most homes, because it is a smart thermostat that also measures CO2, TVOC, temperature, humidity and occupancy, with support for every major smart home platform except Matter. The Aranet Radon Plus is the better choice only if radon is what you need to measure.
Does the Ecobee Smart Thermostat Premium detect radon?
No. The Ecobee Smart Thermostat Premium measures CO2, TVOC, temperature, humidity and occupancy, but not radon. For radon you need a dedicated monitor such as the Aranet Radon Plus, which tracks radon alongside temperature, humidity and atmospheric pressure.
What is the biggest difference between the Aranet Radon Plus and the Ecobee Smart Thermostat Premium?
They are different kinds of device. The Aranet Radon Plus is a battery-powered radon monitor with an E-Ink screen and Bluetooth, while the Ecobee Smart Thermostat Premium is a hardwired thermostat with a colour touchscreen, Wi-Fi and built-in CO2 and TVOC sensing.
Do the Aranet Radon Plus and the Ecobee Smart Thermostat Premium work with Alexa or Apple Home?
The Ecobee Smart Thermostat Premium works with Alexa, Apple HomeKit, Google Home, SmartThings and Home Assistant. The Aranet Radon Plus works with none of those except Home Assistant, and neither supports Matter.
Who should buy the Aranet Radon Plus?
Anyone who needs to know their radon level, from a basement or a ground floor in a radon-prone area, and who is happy reading it on an E-Ink screen, in a Bluetooth app or through Home Assistant.
Who should buy the Ecobee Smart Thermostat Premium?
Homeowners replacing a thermostat who want CO2 and TVOC readings, occupancy sensing and control from Alexa, Google Home, Apple HomeKit, SmartThings or Home Assistant in the same device.
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