The Best Smart Thermostats
Verified by
Ryan V. Editor-in-Chief
When you purchase through links on our site, we may earn an affiliate commission.
The Ecobee Smart Thermostat Premium wins because it does the most for the money you spend at the top of the range. It is the only pick here that reads your indoor air, tracking VOCs, carbon dioxide, and humidity and sending real alerts, a feature Pro Picks, Consumer Betterment, and Royalty Consumer all singled out as a genuine reason to pay flagship prices. It ships with a remote SmartSensor and uses built-in radar to balance temperature across rooms and tell when you are actually home, so the system stops heating an empty house.
It also plays with everyone. Alexa and Siri are built into the device, and it still connects to Google Home, Apple HomeKit, and SmartThings, the widest reach in this test. Anthony Olivieri rated its zinc-alloy body and 4-inch glass touchscreen the best build of the group.
Honesty matters here: the Google Nest Learning Thermostat 4th Gen actually posts a slightly higher overall score on our dimensions, driven by sharper automation and energy savings. We still chose the Ecobee because Nest's aggressive learning fights manual changes, and the one HVAC professional in our sources, Atlas AC, logged the most confused service calls for the Nest and the weakest reliability read of any model tested. The Ecobee gives you more features, broader compatibility, and a steadier ownership story, which is what a serious buyer wants from a $250 device.
What It Won't Do
In Atlas AC's data-logger testing, the Ecobee Premium held the loosest temperature, running a 4-to-5 degree swing that felt less consistent than the Honeywell T9. That wider swing is gentler on your HVAC equipment, but if you want a room dialed to an exact number, you will notice the drift. Its best security features also sit behind a paid subscription, which Shane Whatley and Anthony Olivieri both called out.
The Amazon Smart Thermostat delivers the core of smart climate control for about a quarter of the Ecobee's price. Pro Picks found this budget unit matches the everyday performance of thermostats costing three times as much, and its Energy Star savings of roughly $50 a year mean it pays for itself inside a year. Instead of manual programming, Alexa Hunches learns when you are home, away, or asleep and adjusts on its own. The screen-free faceplate with three touch dots keeps the wall clean, and utility rebates can push the effective price even lower.
What It Won't Do
This thermostat only lives in Alexa's world. There is no Apple HomeKit or Google Home support, and you really need an Echo device to get the most out of it. It also has no built-in display, so nearly every change runs through the app or your voice, and it cannot use remote room sensors to fix hot and cold spots in a larger home.
Who Should Buy Which
Ecobee Smart Thermostat Premium
The most complete smart thermostat, with air quality monitoring and a room sensor in the box.
- Households that want an all-in-one hub with air quality monitoring
- Homes with hot and cold spots that need a room sensor
- Owners spread across Alexa, Google, or Apple ecosystems
- Buyers who value HVAC longevity over a razor-tight temperature
- Older homes without a C-wire, since the Power Extender Kit is included
Amazon Smart Thermostat
Core smart heating and cooling for about $80, if you already live in Alexa’s world.
- Alexa households on a strict budget
- Small homes or single-zone apartments
- Buyers who want automatic scheduling without manual programming
- People happy to control everything by app or voice
- Modern homes that already have a C-wire