Best Smart Thermostats 2018

Product Use case Rating
Ecobee4 Best Smart Thermostat 4.5
Nest Learning Thermostat v.3 Best Smart Thermostat: Runner Up 4.5
Honeywell RTH8580WF Wi-Fi Thermostat Best Budget Thermostat 4
Ecobee3 Lite Best For Small Apartments 4

As we get closer to winter, you don't want your heating costs to burn up all the cash in your wallet. You may want to consider investing in a smart thermostat, which will not only let you you monitor and control your home’s temperature from your smartphone, PC or tablet—but can help reduce your energy bill too. That’s because these devices can monitor temperature and humidity inside and outside your home, your comings and goings, and tailor heating and cooling cycles accordingly.

Based on our comprehensive testing, the Ecobee4 is the best overall choice in this category because its sensors let you deliver the right temperature on a room-by-room basis. It also knows which rooms are occupied and comes with an intuitive app, and it works with Apple's HomeKit among many other smart home systems. Plus, it has Alexa built in, so you can interact with Amazon's voice assistant without purchasing an Echo or an Echo Dot.

If you're looking for something less expensive, then we recommend the Honeywell RTH8580WF Wi-Fi Programmable Touchscreen Thermostat. It's not as fancy as the Ecobee, but it costs less than $100, works with many smart home systems, and can be controlled from your smartphone. (Ed. note: the RTH8580WF is currently unavailable on Amazon, but the RTH6580WF provides similar capabilities, such as Alexa compatibility.

Still, the Nest Learning Thermostat is no slouch; in addition to automatically learning your heating and cooling preferences, you can link it directly to other smart home devices through Nest's app. For example, when the thermostat turns to Away mode, it can automatically turn off your smart lights. Here are the best smart home devices that are compatible with Nest.

Latest News & Updates (December 2018)

  • The Ecobee4 is currently $199 ($50 off), and includes a remote sensor.
  • Most smart thermostats are designed for low-voltage systems. However, if your thermostat—such as those that control baseboard heaters—requires a high-voltage unit, then the Mysa smart thermostat ($129) may be worth a look. It's controllable using a smartphone app, and works with Amazon Alexa, Google Home, Apple HomeKit and IFTTT.
  • iDevices' thermostat ($69) is now compatible with Google Assistant; previously, it could only work with Alexa and Apple HomeKit. Users can now use any of those smart assistants to control the thermostat using their voice. With this addition, it's the only thermostat other than Ecobee's that works with all three smart assistants.

The Ecobee4 has all the great things in the Ecobee3—such as its slick touchscreen interface, a small wireless sensor to make sure all your rooms are the right temperature, and compatibility with most major smart home systems. However, the Ecobee4 has one more feature: Alexa. A built-in speaker and microphone let you interact with Amazon's assistant as you would with the Echo or the Echo Dot. Still, the fact that I could get all of my rooms—not just one—to the right temperature makes all the difference.

The third version of this Google-owned thermostat has a larger and sharper display than its predecessor. Like before, the Nest Learning Thermostat can talk to hundreds of other smart home devices—from the Logitech Harmony remote to the Amazon Echo to the Nest Cam—so it can automatically change the temperature when someone comes home, or if you’re about to watch a movie. While it has a retro-style circular design, its brushed stainless steel finish and turning mechanism all feel premium. This thermostat combines the best of the past with the future.


MORE: How to Connect a Nest Thermostat to Amazon Alexa

The Honeywell RTH8580WF Wi-Fi Thermostat offers much of the same functionality as the Nest and Ecobee, but for less than half the price. While it looks like a run-of-the-mill thermostat on the outside, a Wi-Fi link lets you control this thermostat from your smartphone, just like the more expensive models. Plus, it can link to other smart home gadgets, such as smart locks, and can be controlled via voice. In all, it's a great bargain.

Honeywell is phasing out the RTH8580WF but the RTH6580WF ($87) provides similar capabilities, such as Alexa compatibility.

A less expensive alternative to the Ecobee3, the Ecobee3 Lite has many of the same functions, including a color touchscreen, intuitive interface and deep smart home integration. Ecobee also updated the Lite model to work with remote sensors (as with the full-price Ecobee4), so you can set it to keep the heat on until a room in a far corner of your house reaches a certain temperature.

Other Smart Thermostats We Reviewed

  • Johnson Controls' GLAS thermostat ($279) has a cool-looking glass touchscreen, monitors air quality in your home, has Cortana built in, and works with Alexa. For all that, though, it left us feeling a bit cold.
  • The Nest Thermostat E ($169) is another excellent smart thermostat for less than $200. It's easier to set up than the pricier Nest Learning Thermostat, but still has many of the same features.
  • The Bosch BCC100 Thermostat has a large and colorful touchscreen, is easy to set up, and works with Alexa. At $144, it's a very good mid-range thermostat, but we prefer the Ecobee3 for its remote sensor and geofencing capabilities.
  • The best aspect of the Honeywell Lyric ($211) is that it uses geofencing to know when to turn on and off. When linked to your smartphone, it will know when you’re nearing home, and start heating or cooling your abode so that it’s toasty warm--or refreshingly cool--by the time you walk in the front door.
  • The Honeywell Lyric T5 ($129) has many of the same features as its pricier Lyric Round (Alexa and HomeKit integration, for one), but costs about half as much. You can control the T5 from Android or iOS devices, and geofencing will automatically turn your system on or off when you leave or arrive home. It can also learn and adapt to your home's heating and cooling cycles, and remind you to change the air filter. Like the Lyric, it also works with Apple HomeKit, Amazon Alexa, Google Home, Samsung SmartThings, and IFTTT.

How to Install a Smart Thermostat

For the most part, installing a thermostat, smart or not, is a fairly easy process, usually involving nothing more than a screwdriver and about half an hour of your time. Here's our video guide for installing a Nest thermostat, however, the procedure is similar for almost any thermostat.

How We Test Smart Thermostats

We install each thermostat in a home or apartment and live with it for at least one week, to see how it handles different conditions. This includes not just changing the temperature, but also evaluating its accompanying app and web portal, if available. If the thermostat works with other smart home devices or Web-connected services (such as Alexa), we test that functionality as well.

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  • wolf39
    Sorry - it's simply not true that Ecobee can support multiple zones. IT definitely CAN'T! It supports multiple thermostats, however it is not able to control multiple zones, which makes multiple thermostats kind of obsolete and nonsensical (unless you want to raise room temperature everywhere if you for example your bedroom is too cold). If you need multiple zone control support you need to get evohome or tado.
  • Carl_12
    Can we install a thermostat ourselves ??
  • bukzin
    Yes, these are meant to be installed by homeowners.
  • Nguyen_13
    thank for you sharing!
  • SteveReeves
    I think the room sensors that allow for temp control in the room that you're in is great!

    I've seen some smart vents that close themselves off too.

    Wonder if Nest is doing anything to counter this in upcoming releases.
  • gardavis
    The Ecobee3 Lite now can support the sensors. In fact, they have a promotion at the vendor's site that includes 2 sensors and the Lite for $169. Also, I don't think the display is color as you say.
  • chumgrinder
    Our home has two independent HVAC units. Our power company just introduced demand pricing that makes it very desirable for us to ensure that only one unit operates at a time. I suspect there must be a thermostat product that allows two thermostats to coordinate such that they take turns. Can anyone recommend one?
  • ctn.gooners
    Nest does not make a thermostat that controls the maintenance band and does not allow users to modify and adjust the band that is stuck at +/-1°F. If you have an old cast iron heater system, DO NOT BUY a Nest. It will force your system to start up Everytime it drops a degree, and initial start ups will use more natural gas, therefore Nest does not save money. Nor does do they offer any help to remedy or fix the problem.
  • reidg99
    Mike, I see very little information about notifications due to a power outage. I’m considering a Honeywell smart thermostat because it’s monitored by an outside server. From what I was told by Honeywell support, if I have a power outage their server will notify me that the thermostat is offline. That’s important to avoid frozen pipes at second homes, in my case a ski camp, or a primary home should it be left during vacation or otherwise in the winter. This service/feature is not considered in any of the top rated or recommended thermostat articles I’ve read...but should be. With that said, are there other smart thermostats that meet the above requirements that I should consider.
  • rashisaxsena
    Thank you for this list of thermostats