Smart thermostats do more than automate a fixed heating and cooling schedule. These app-enabled smart home devices make it possible to adjust your thermostat whether you’re on the couch, at the grocery store or on vacation — anywhere your smartphone is connected to a cellular or a Wi-Fi network. Many of these devices also work with Alexa, Google Assistant and Siri now too, giving you yet another way to adjust your thermostat settings without having to stand directly in front of it. 

Some smart thermostat systems also use smart features like a motion sensor to determine if you’re home or away and automatically change the temperature — both heating and cooling — for you. Other systems rely on a geofencing radius — once you get a certain distance from your home, they switch to away mode and then back to home mode when you return.  

To accompany these modern features, a lot of connected thermostats boast innovative designs. From a rounded shape to a responsive touchscreen, today’s thermostats look different than they used to.

Let’s explore the available options model-by-model. We’ll highlight what makes each model stand out from the rest and ultimately pick an overall winner of the best smart thermostat from the pack. Here’s a list of smart thermostats we’ve tested recently:

The products discussed here are independently chosen by our editors after hands-on evaluation and testing. CNET may get a share of the revenue if you buy anything featured on our site.

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The Ecobee SmartThermostat is my favorite pick for best smart thermostat available today. Yes, it’s expensive at $249, 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. If you don’t want or need an Alexa speaker, the $169 Ecobee3 Lite Wi-Fi thermostat is also a great option.


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The Honeywell Lyric T5 costs $150. I know that isn’t exactly affordable. But it’s a solid price tag for a Wi-Fi thermostat. Many models, including the Nest Learning Thermostat and the Ecobee4, cost $249. This makes the T5 a great “budget” option that works with Alexa, Google Assistant and Siri (via Apple HomeKit). 

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The Ecobee SmartThermostat has a built-in Alexa speaker. Ask the speaker for the temperature, current weather forecast, to tell you a joke — and to adjust the air conditioning of your smart thermostat, all without needing a separate Alexa speaker. This Wi-Fi programmable thermostat also offers integration with Google Assistant and Siri, so if you have a Google-Assistant-enabled smart speaker or a HomePod, you can control it with Google Assistant and Siri commands. 

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The Ecobee mobile app is straightforward and easy to install and navigate. That sounds simple enough, but so many apps make it tough to find the specific setting or feature you’re looking for. Not so with Ecobee’s smartphone app. And that’s important because the mobile app is one of the main ways to interact with your Wi-Fi thermostat when you aren’t standing directly in front of it (aside from using a voice command). 

Testing a thermostat

Let’s talk about testing. Smart thermostats start with the installation. Installations can vary widely from thermostat to thermostat and HVAC system to HVAC system, but there are some basic steps required for installing these devices. As always, consult a professional installer if you have any questions about the setup process. Here are the general steps:

  • Turn off power to your thermostat at the circuit breaker
  • Remove the old thermostat
  • Install the thermostat’s baseplate with the included screws
  • Attach the wires to the wire terminals 
  • Snap on the faceplate
  • Turn on power at the circuit breaker

Was the thermostat especially difficult to install? If so, why? Certain models require a C-wire, for example, which can complicate the installation if you don’t have one. Not sure what a C-wire is? Start here

From there, I move on to the app. Every smart thermostat has one. I download the app and create an account if I don’t already have one. Then I configure the thermostat following the steps in the app. This usually means connecting to the local Wi-Fi network, giving your thermostat a name like “Hallway” or “Bedroom” and then you can start using your thermostat.

How well does the app work? Is it easy to navigate to the thermostat settings you need? Is it simple to create a schedule or enable geofencing? This factors into the thermostat’s usability score, along with how simple the thermostat hardware itself is to control manually. 

I also test smart home integration, especially voice-enabled systems you can access through voice assistants like Alexa, Google Assistant or Siri. Most connected thermostats have compatibility with at least one voice assistant and some, like the Ecobee3 Lite and Ecobee SmartThermostat, work with all three. Do the voice commands flow naturally, like they would in an actual conversation? Did the thermostat actually adjust the temperature — heating and cooling — according to your commands? 

All of these things determine a smart thermostat’s overall score and how likely I am to recommend it. 

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Megan Wollerton

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