Ecobee Smart Thermostat Premium Review: Air Quality Monitoring Built Into the Thermostat
CO2, TVOC, temperature, humidity and occupancy sensing on a 4 inch touchscreen, with alerts and filter reminders, and support for every major platform except Matter.
Judged as an air quality monitor, the Ecobee Smart Thermostat Premium is the rare device that measures the air and can act on it, because the same unit controls the heating and ventilation. It tracks CO2 and TVOC alongside temperature, humidity and occupancy, raises alerts when air quality drops, and reminds you to change the air filter. It works with Google Home, Alexa, Apple HomeKit, SmartThings, Home Assistant and IFTTT, which is as broad as compatibility gets. What it does not do is particulates: there is no PM2.5, PM10, CO, NOx or radon sensing, so smoke, dust and pollen are outside its scope.
- Whole-home ventilation control
- CO2 and VOC tracking
- Multi-platform smart homes
- Replacing a thermostat and a monitor at once
Pros
- CO2 and TVOC sensing built into the thermostat
- Air quality alerts with improvement tips, plus air filter change reminders
- Temperature and humidity sensing, with alerts for sudden temperature swings
- Occupancy sensing
- Works with Google Home, Alexa, Apple HomeKit, SmartThings, Home Assistant and IFTTT
- 4 inch colour touchscreen at 540 x 540
- Dual-band Wi-Fi (2.4 GHz and 5 GHz) plus Bluetooth 5.0
- History records and automation support
- Three year warranty
Cons
- No particulate sensing at all: no PM2.5, PM10 or finer
- No carbon monoxide, NOx or radon sensing
- No humidity alerts, despite measuring humidity
- No Matter support
- Hardwired installation, with no battery option
- Expensive if you only want an air quality monitor
Who is it for as an air quality monitor?
Most air quality monitors can only tell you the air is bad. This one is wired into the system that can fix it, which is the argument for buying a thermostat that measures air quality rather than a separate sensor on a shelf. It suits someone replacing a thermostat anyway who would otherwise buy a CO2 monitor as well, and it fits any ecosystem, with Google Home, Alexa, Apple HomeKit, SmartThings, Home Assistant and IFTTT all supported. The 4 inch colour touchscreen at 540 x 540 shows the readings on the wall, and both 2.4 GHz and 5 GHz Wi-Fi are supported, which is unusual in this category.
What it measures
The air quality side covers CO2 and TVOC. CO2 is the ventilation signal, the pollutant that climbs in closed rooms and is linked to poor sleep and trouble concentrating, and TVOC is the aggregate of volatile organic compounds coming off cleaners, aerosols, glue, new furniture and carpets. Temperature and humidity come with the thermostat function, and there is occupancy sensing too, which is what lets it distinguish an empty house from an occupied one. Air quality alerts warn when the air gets poor and the system offers suggestions for improving it, and air filter change reminders keep the HVAC side working properly. Temperature alerts flag sudden drops or spikes that could damage the home, which is the kind of warning that matters while you are away.
What to know before you buy
There is no particulate sensing of any kind: no PM0.1, PM0.3, PM1, PM2.5 or PM10, so wildfire smoke, cooking particles, dust and pollen are invisible to it. There is also no carbon monoxide, no NOx and no radon sensing, so it does not replace a CO alarm or a radon detector. Humidity is measured but cannot raise its own alert. Matter is not supported. It is a hardwired device, which means an installation job and, in older homes, potentially a C-wire or adapter, and it has no battery option. Physically it is an indoor wall unit at 103.89 mm square and 630 g.
Is it worth it as an air quality monitor?
On its own the price is high for a CO2 and TVOC monitor. The economics only work if you also want the thermostat, in which case the air quality sensing effectively arrives free with a device you were buying anyway, and it comes with a three year warranty, longer than most in either category. If particulates matter to you, plan on a second, dedicated monitor: this one covers the gases and comfort side well and the particle side not at all.
Frequently asked questions
What air quality does the Ecobee Premium actually measure?
CO2 and TVOC (total volatile organic compounds), alongside temperature, humidity and occupancy. It does not measure particulates, carbon monoxide, NOx or radon.
Does it warn me when the air is bad?
Yes. The built-in air quality monitor raises alerts when air quality is poor and suggests ways to improve it, and it also sends air filter change reminders.
Which smart home platforms does it work with?
Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant and IFTTT. Matter is not supported.
Can it detect smoke or wildfire particles?
No. There is no particulate sensor, so PM2.5 and PM10 pollution from smoke, cooking or dust is not measured.
Does it need to be wired in?
Yes. It is a hardwired thermostat with no battery option, so installation involves your HVAC wiring.














