The best smart thermostats and sensors of 2022

Experts and owners widely agree that Google's Nest Learning Thermostat is the most advanced option available. Not only does it offer a refined, streamlined user interface, but its learning algorithm also makes it especially effective even with minimal input. It's equipped with basic functions such as remote access and geofencing, and premium considerations, including multi-zone control and support for both 2.4 GHz and 5 GHz networks. It also looks and feels like a premium piece of equipment, with a 24-bit color screen and robust build quality. It's compatible with external Nest temperature sensors and, unlike some others, works perfectly with the competition's voice assistants, including Alexa. Interestingly, it's one of the few that doesn't absolutely require a C-Wire.

Instead, it turns on your HVAC system when its battery runs low to recharge itself. Although some people might find it annoying, this should be a fast and easy process with the average home setup. It also doesn't work with all systems, such as heat pumps. You (or a professional) may need to install a C-Wire or adapter in those cases. All in all, there are a few downsides to the latest Nest Learning Thermostat. Be aware, however, that if you plan on migrating to the upcoming Google Matter platform, you'll almost certainly be out of luck. Google has already confirmed that this version will be left behind, and that's not likely to change.

• Integrations: Alexa, Google, SmartThings
• Connectivity: Dual-band Wi-Fi
• C-Wire or adapter required: No

One of a few smart thermostats in the company's current lineup, the Ecobee Premium is one of the most refined models available. Its revamped temperature sensors and radar-based motion detectors make for more consistent readings and automatic activation. It even serves as an Alexa or Siri smart speaker all on its own. You can also connect it to a Google-based smart home system, although the Assistant itself isn't baked in. It does require external power — usually via a C-Wire — but if your existing system doesn't have one, Ecobee offers an optional power extender kit. The Premium also improves the appearance, and general fit and finish of its predecessors and lesser relatives, with a sleek zinc-alloy body and glass touch screen. Given its precision monitoring and reliable programming options, it's an excellent choice if you're willing to make the investment.

• Integrations: Alexa, Google, HomeKit, SmartThings
• Connectivity: Dual-band Wi-Fi
• C-Wire or adapter required: Yes

One look at the price and appearance of the Amazon Smart Thermostat, and you probably wouldn't think much of it. In reality, though, it competes with far more expensive options (though much simpler) and can use Alexa Hunches for intuitive and helpful on-the-fly control. Granted, its smartphone app control isn't particularly streamlined, but it's explicitly designed for Alexa voice control. Therein lies one of the few drawbacks of this well-engineered yet powerful option. If, for whatever reason, you don't want to use Alexa for climate control, then Amazon's thermostat is not for you. Furthermore, it's unsuitable for multi-zone HVAC setups, as it doesn't work with any add-on temperature sensors. But if you want a practical and straightforward controller for your Alexa-centric smart home, there are no cheaper options.

• Integrations: Alexa
• Connectivity: 2.4 GHz Wi-Fi
• C-Wire or adapter required: Yes

Compared to its more expensive relative, the Ecobee3 Lite has been stripped of some advanced features, but they're ones that not everyone needs. For example, it loses the integrated microphone, which isn't necessary if you have other smart speakers. It also supports heating and cooling only and can't control humidification or ventilation appliances. Many homeowners won't even notice those are gone. The only thing missing from the Ecobee3 Lite that stings a little is the lack of convenient geofencing. Instead, it relies on motion sensors to turn on and off automatically.

It's not the end of the world, as you can use IFTTT as a workaround without a ton of difficulty. You'll just have to set up a separate contingency for each smartphone you want to use geofencing. Ultimately, if none of those issues are dealbreakers for you, it's worth considering this over the Premium because it takes less time for it to pay for itself.

• Integrations: Alexa, Google, HomeKit, SmartThings
• Connectivity: 2.4 GHz Wi-Fi
• C-Wire or adapter required: Yes

Not unlike the Ecobee3 Lite's relationship with the Premium, the Google Nest Thermostat is essentially a slimmed-down version of the more costly Nest Learning Thermostat. It has some of the same features, but lacks much of the high-end considerations. Most notably, it doesn't actively track and learn from your patterns or support external temperature sensors. Also, the trim plate is sold separately; it's not quite as nice-looking and is built with a plastic ring instead of a metal one. Nonetheless, it retains plenty of functionality and especially a high degree of convenience. It upholds Google's reputation for user-friendly operation, and the radar-based motion detector is especially effective. If you're not concerned with a smart learning algorithm or multi-zone control, it's worth considering.

• Integrations: Google
• Connectivity: Dual-band Wi-Fi
• C-Wire or adapter required: No

In a way, the Honeywell Home T9 is the smart thermostat for people who don't like to mess around with complicated smart devices. In other words, if you want to upgrade your HVAC system with digital, connected control but still want a measure of manual control, it's a great option. You can program a timed schedule or use geofencing to turn it on or off. Its remote sensors detect temperature, humidity, and movement, so the system is always active in occupied rooms. If you're working with a complex, multi-zone system, the T9 is one of the best choices due to the intricate level of wireless control it offers.

The issues with it are small, but noticeable. For instance, it's taller than it is wide, unlike most others. So it doesn't usually cover the entire hole from the previous thermostat, nor does it come with a large enough base plate to fix that. You're also not able to activate geofencing and a timed schedule at the same time. Aside from a few minor quirks, though, it's a reliable, professional-quality thermostat.

• Integrations: Alexa, Google, HomeKit, SmartThings
• Connectivity: 2.4 GHz Wi-Fi
• C-Wire or adapter required: Yes, adapter included

The moderately priced Emerson Sensi Touch offers straightforward operation and support for Apple HomeKit, which is rare among today's smart thermostats. Its easy-to-use touchscreen and mobile app offer custom scheduling and geofencing settings and notify you of abnormal operations or upcoming maintenance schedules. While most send you reports via email or the app, you can pull up daily and monthly energy usage on the unit itself. The most important thing to be aware of when setting up the Sensi Touch is that if you have a two-stage HVAC system or appliances like a central humidifier, you'll need to pay special attention to some advanced settings. The only other drawbacks are its lack of any external sensor or IFTTT support.

• Integrations: Alexa, Google, HomeKit, SmartThings
• Connectivity: 2.4 GHz Wi-Fi
• C-Wire or adapter required: Yes

This one's quite a bit different from the rest. It's not meant for central HVAC systems, but instead smaller, single-room units such as mini-split heat pumps and window air conditioners. It doesn't quite match the smarts of most of the competition, as it only controls a single unit and doesn't offer motion detection or energy use reports. But it does add conditional scheduling, geofencing, and IFTTT to any standalone HVAC system with an IR port. It has its own minor quirks, such as a lack of informational readout on the device itself. It also tends to be a touch imprecise in terms of activating the HVAC unit because Sensibo relies on the unit's internal temperature sensor rather than its own. Regardless, it's an effective way to add smart features to any old remote-controlled air conditioner. While it doesn't natively support the Apple HomeKit platform, it works swimmingly via the third-party app HomeBridge.

• Integrations: Alexa, Google, HomeKit via HomeBridge
• Connectivity: 2.4 GHz Wi-Fi
• C-Wire or adapter required: No