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Nest Learning Thermostat (3rd Gen) review: Same great Nest, now with a temperature sensor

For example, if you regularly cook in the evening, stick a temperature sensor in your kitchen. Since that room/area likely gets warmer during that time, you can set the "Kitchen" sensor to be the default temperature reading between 4 and 9 p.m. every night. That way, your heating and cooling will adjust around the temperature in the kitchen, rather than the lower temperature where your thermostat is located.

Nest's Learning Thermostat also offers Family Accounts and Home/Away Assist, two new features that help improve performance. Family Accounts lets users in the same household set up their own Nest accounts (instead of the shared family accounts that the company offered previously). Once Family Accounts are created, Home/Away Assist jumps into action by tracking each person's phone location. It isn't exactly the same as geofencing, as there's no geofenced range, but it does make it even easier for Nest to keep an eye on your whereabouts.

This model also adds a function it calls Furnace Heads-Up, for those with a forced-air furnace system. Essentially, this feature keeps track of the times your forced-air furnace automatically turns off to prevent overheating. And, if it senses that there's a potential issue, it will alert you in the Nest app, on the thermostat screen and in your monthly energy usage email. 

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Customize your temperature sensors in the Nest app.

Screenshots by Megan Wollerton/CNET


While there are some clear design and feature differences between this Nest and previous iterations, version 3.0's installation, Wi-Fi and app configuration, performance and overall usability remain roughly the same.

Of course, installation will vary widely depending on your heating and cooling system, but the third-gen Nest Learning Thermostat is by far the easiest model I've ever installed. It comes with the same tiny, but functional screwdriver and built-in level as well as a basic rectangular baseplate for covering up any unsightly holes or patchy paintwork from previous installs and a steel plate for mounting your thermostat to an electrical box.

It took me about 10 minutes to install my model from start to finish; here's a quick overview of the process:

  • Turn off the power running to your heating and cooling system.
  • Remove your existing thermostat.
  • Attach the new base plate (optional) and thermostat base. Screw them down with the included hardware (Luckily, I already had holes that lined up with the new thermostat, which saved me some time.).
  • Connect the wires to their respective ports. In my case, that included Y, G, W, Rh and C wires (Please note: Many older systems rely on a four-wire configuration -- typically just a Y, G, W, and Rh or Rc -- because older thermostats didn't need to power fancy LED displays. Confusingly, some four-wire configurations will actually work with this thermostat. Consult a professional if you have any questions or concerns. Nest has experienced some friction since its four-wire setup relies on a process HVAC professionals refer to as "power stealing." This method can damage your HVAC system if not done correctly. I had a second-gen Nest set up using just these four wires for years without any problems whatsoever.)
  • Pop on the face plate.
  • Turn the power back on. (Didn't work? Here's Nest's more in-depth installation tutorial.)

Now you're ready to configure your Nest. Your unit will power on and walk you through the process, which includes: setting your language; connecting to your local Wi-Fi network; updating any out-of-date software; setting your location; answering some basic questions about your HVAC system; inputing your preferred temperature ranges for heating and cooling; and performing a quick (optional) system test.

This sounds like a lot, but you can breeze through most of it pretty quickly; if you aren't sure what sort of HVAC system you have, you can select "I don't know" and return to it later on. And, if you don't already have a Nest account, you can now download the app on your Android or iOS device of choice and dive into custom preferences, such as Farsight, vacation modes and integrating with other Nest products and third-party smart devices.

Nearly done with the installation.

John Kim/CNET

The smart stuff

While the Ecobee4, the Honeywell Lyric and the Honeywell Lyric T5 all have related apps and innovative smarts of their own (Ecobee relies on a remote temperature sensor and built-in motion sensors to track your home or away status; the Honeywell Lyric and Lyric T5 use your phone's GPS location), Nest has the most comprehensive smart device support of its major competitors.

That's entirely due to Nest's growing range of product categories, which today includes four security cameras, a smoke and carbon monoxide detector, a lock, a doorbell, an alarm system and two thermostats. All of these devices are accessible through the same Nest app and can be used in conjunction with one another. If a Nest Protect ($70 at eBay) senses smoke or carbon monoxide, it's supposed to display an alert on your Learning Thermostat's screen and shut off forced air systems (when smoke is detected) or fossil-fuel heating (when carbon monoxide is detected). 

You can read more about the specific ways Nest products work together on this support page.

Nest works with Google Assistant and Amazon Alexa, too. Just go to the Google Home ($99 at Walmart) or the Alexa app and configure the Nest thermostat to work with your smart speaker of choice. Then you can ask, "OK, Google/Alexa, change the entryway thermostat to 68 degrees," OK, Google/Alexa, raise the entryway thermostat by 3 degrees," and a whole lot more. This voice control integration goes a long way to help Nest maintain its stronghold in the smart thermostat market, but the Ecobee4 works with Google Assistant, Alexa and Siri.

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Nest's Farsight feature tells you the weather forecast.

Tyler Lizenby/CNET


The $249 third-gen Nest Learning Thermostat is no longer the revolutionary product it was in 2011, but the Google-owned brand has managed to maintain its status as a smart-climate-control leader in spite of the rapidly changing landscape. Its support for Google Assistant and Alexa voice commands, improved design and new Farsight, Family Accounts and Home/Away Assist features only add to its already impressive performance and ease-of-use via the smartly-designed Nest app. 

Adding a temperature sensor to the lineup helps Nest hold its own alongside Ecobee, too, making the third-gen Learning Thermostat easy to recommend (especially if you're already invested in the Nest/Google platform). Even so, the $249 Ecobee4 is still my top pick if you're in the market for a smart thermostat. It works with more smart home partners (including Apple HomeKit) and comes with a temperature sensor at no additional cost. 

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