Best Smart Thermostats
16 products ranked across 391 cited reviews, videos and discussions · Updated 10 Sept 2026
On the stierproducts smart thermostats board, Ecobee Smart Thermostat Premium ranks #1 in S tier, ahead of Google Nest Learning Thermostat (4th Gen) (#2, A tier) and Ecobee Smart Thermostat Essential (#3, A tier). The board ranks 16 smart thermostats from S (best) to F (avoid), last researched 10 Sept 2026, drawing on 391 cited reviews, videos and discussions. Placed in the bottom tiers as ones to avoid: Aqara W200 Thermostat, Vivint Smart Thermostat, Cielo Breez Max, and 3 others.
Moved down from B to C on 27 Jul 2026 #6 3 of 10 research runs entered this as a product to avoid rather than a pick. Amazon Smart Thermostat
#7 Honeywell Home T9 Smart Thermostat
Moved up from D to C on 27 Jul 2026 #8 1 of 9 research runs entered this as a product to avoid rather than a pick. Honeywell Home X8S
#9 Mysa Smart Thermostat for Electric Baseboard Heaters
#10 1 of 9 research runs entered this as a product to avoid rather than a pick. Google Nest Thermostat
Moved down from D to F on 27 Jul 2026 #12 4 of 5 research runs entered this as a product to avoid rather than a pick. Vivint Smart Thermostat
Moved down from D to F on 27 Jul 2026 #13 1 of 7 research runs entered this as a product to avoid rather than a pick. Cielo Breez Max
#14 2 of 5 research runs entered this as a product to avoid rather than a pick. Google Nest Learning Thermostat (3rd Gen)
#15 2 of 5 research runs entered this as a product to avoid rather than a pick. Honeywell Home X2S
#16 6 of 9 research runs entered this as a product to avoid rather than a pick. Wyze Thermostat
What moved on this board
28 tier changes recorded between 22 Jul 2026 and 14 Sept 2026. The 5 most recent are below.
- 27 Jul 2026 Cielo Breez Max moved down from D to F. 2 more research games. 3 sources added.
- 27 Jul 2026 Vivint Smart Thermostat moved down from D to F. 2 more research games. 2 sources added.
- 27 Jul 2026 Aqara W200 Thermostat moved down from B to D. 3 more research games. 4 sources added, 1 removed.
- 27 Jul 2026 Honeywell Home X8S moved up from D to C. 1 more research game. 1 source added.
- 27 Jul 2026 Amazon Smart Thermostat moved down from B to C. 3 more research games. 2 sources added, 4 removed.
Each line shows what else changed at the same publish. It is not a statement of cause.
Frequently asked questions
Ecobee Smart Thermostat Premium sits at #1 in the S tier of our consolidated board, ranked across independent research runs over 391 cited reviews, videos and discussions. The premium model delivers the most consistent temperature control, robust air-quality monitoring and a long-term firmware track record. Its hardware is durable, warranty is 2 years with optional 5-year extension, and support is responsive.
Google Nest Learning Thermostat (4th Gen) ranks #2 (A tier). The latest Nest offers the best learning algorithm, seamless integration with Google Home, and a solid build. Firmware updates have been consistent for three years, and its 3-year warranty plus optional extended plan gives peace of mind.
Our research places Aqara W200 Thermostat, Vivint Smart Thermostat, Cielo Breez Max, Google Nest Learning Thermostat (3rd Gen), Honeywell Home X2S, Wyze Thermostat in the bottom tiers (D/F). Aqara W200 Thermostat: The Aqara W200 Thermostat’s low cost is offset by frequent connectivity problems, short warranty, and minimal firmware support, making it unreliable long term.
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