Since our last few blog posts have been about smart thermostats, we figured we’d end November with some reviews of the best smart thermostats of 2021 from CNET.

Best overall: Amazon Smart Thermostat

Chris Monroe/CNET

The $60 Amazon Smart Thermostat is the least expensive smart thermostat I’ve tested. It works via the Alexa app and with Alexa voice commands. You need a compatible Alexa-enabled smart speaker or display to use voice commands, but you don’t have to enable an Alexa skill since this is an Amazon-branded product.

This thermostat also looks nice. It has a simple, modern design and an optional wall plate if you need to cover any old paint or holes. The touchscreen interface is minimal, but makes it easy to adjust thermostat and switch among heat, air conditioning and other basic settings. 

The Amazon Smart Thermostat isn’t compatible with Google Assistant or Apple HomeKit and there’s no remote temperature sensor accessory. You also either need a C-wire or you have to buy and install the C-wire adapter.

This is a solid product overall, but ultimately its amazing value is what sets it apart and makes it our current favorite. 

Best voice integrations: Ecobee SmartThermostat with Voice Control

Chris Monroe/CNET

At $249, the Ecobee SmartThermostat with Voice Control is expensive, but it has the performance and features to back it up — especially if you want to talk to Alexa without having to buy an Amazon Echo. This model also works with Google Assistant and Apple HomeKit, as well as Spotify. If you want a connected thermostat, Ecobee’s SmartThermostat with Voice Control is the smartest around.

Best remote sensor: Resideo Honeywell Home T9 Smart Thermostat

Chris Monroe/CNET

The Honeywell Home T9 is a $200 smart thermostat from Resideo. The T9 works with Alexa, Google Assistant and Apple HomeKit and offers reliable performance and a solid app. The device also comes with remote humidity, proximity and temperature sensors, making it the smartest sensor accessory around. Nest’s sensor only provides ambient temperature readings, while Ecobee’s sensor only has temperature and proximity detection capabilities.

Best design: Nest Learning Thermostat

Tyler Lizenby/CNET

I hold that the $249 Nest Learning Thermostat is still the best-looking smart thermostat out there. Its rounded design harkens back to old-school thermostats, but the device has a modern look that fits in with nearly any home decor. The $169 Nest Thermostat E looks nice too, but it has more plastic components that aren’t as appealing as the Learning Thermostat’s stainless steel.

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