We review products independently, but we may earn affiliate commissions from buying links on this page. Terms of use. The Honeywell Home T9 With Sensor ($199.99) is a feature-packed smart thermostat that uses remote room occupancy sensors to ensure uniform heating and cooling throughout your entire home. Easy to install and manage using a built-in touch-screen display, a mobile app, or your voice, the T9 offers dual-band Wi-Fi connectivity and works with other smart home devices via IFTTT applets, although IFTTT trigger options are limited. It worked flawlessly in our tests, but it lacks a few of the extra features that you get with our Editors' Choice, the Ecobee Smart Thermostat With Voice. It's a bit more expensive at $249, but it has the ability to function as an Alexa speaker and features support for Apple HomeKit, making it worth the extra $50. Design and Features As with the Honeywell Lyric T5 that we reviewed a few years back, the T9 thermostat eschews the round puck-like form factor used by the first Lyric thermostat and popularized by Honeywell's original T86 model. Instead, it uses a white rectangular enclosure that measures 4.9 by 3.7 by 0.9 inches (HWD) and has a 3.3-inch (diagonal) color touch display. The thermostat contains temperature and humidity sensors and is equipped with dual band Wi-Fi circuitry that allows you connect to your home network over the 2.4GHz and 5GHz radio bands. The T9 comes with a wireless smart room sensor, a C-wire adapter (for homes that don't have a C-wire), mounting screws, a mounting plate, wire labels, and an installation guide. The thermostat is compatible with most standard HVAC systems and contains push-to-connect wire terminals for heating and cooling as well as auxiliary terminals for things like heat pumps and fans. As with the Ecobee Smart Thermostat With Voice, the T9 uses smart occupancy sensors to ensure that when people are present, the temperature in select rooms is the same as the room temperature where the thermostat is installed. It comes with one sensor, but you can buy additional sensors (up to 20 total) for $39.99 each or $74.99 for a two-pack. The T9 supports Amazon Alexa, Google Assistant, and Microsoft Cortana voice commands, but doesn't yet offer support for Apple HomeKit, although that is in the works. You can have it interact with other smart home devices using IFTTT applets, and it works with the Lutron and SmartThings home automation platforms. However, it doesn't integrate with other Honeywell smart devices such as the Lyric C2 Wi-Fi Security Camera and the Lyric Wi-Fi Water Leak and Freeze Detectors. The thermostat can be controlled and programmed using its touch display or the Honeywell Home mobile app for Android and iOS (the same app that controls Lyric smart devices). The app opens to a screen that displays the local weather conditions and has tabs for all of your Honeywell Home devices including thermostats, cameras, and water sensors. Tap the T9 thermostat tab to open a screen that shows the same information as the thermostat's display. At the top of the screen are the current room temperature and humidity readings, and right below that you'll find the current target temperature and up/down arrows for adjusting the target temperature. At the bottom of the screen are Mode, Fans, Priority, and Schedule buttons. Use the Mode button to turn heating and cooling on and off, and use the Fans button to change fan settings (if fans are connected). The Priority button allows you to select rooms that will contribute to the average temperature in your house. For example, you can have just the T9 determine the average temperature based on your target temperature or have rooms that show activity (occupancy) contribute to the average. The Schedule button takes you to a screen where you can create heating and cooling schedules for a group of days or single days. Here you can also enable geofencing to have the T9 adjust temperatures when you (and your phone) are at home or away. Tap the gear icon in the top right corner to access the Settings screen. Here you can manage alerts, set filter reminders, enable Adaptive Recovery (begin heating and cooling early so that your house reaches its target temperature on schedule), and congifure Wi-Fi settings. The Devices & Sensors setting lets you check the temperature and humidity in each room where a sensor is located, check sensor battery levels and signal strength, and enable motion detection. Installation and Performance As with most of today's smart thermostats, the T9 is easy to install, but you might want to bring in a professional if you're not comfortable working with electrical wiring. Start by turning off power to the circuit that runs your current thermostat. Take pictures of the wiring scheme and use the included labels to identify these wires later on. Remove the old thermostat, disconnect the wires, and pull the wires through the hole in the T9's mounting plate. Attach the plate to the wall using the mounting screws (also included) and connect each wire to its corresponding terminal. If your system doesn't have a C-wire (common), follow the instructions to install the C-wire adapter. Once the mounting plate is wired up, snap the T9 into place, wait for the thermostat to power up, and follow the instructions on the touch panel. When prompted, tap Get Started and select your language. You'll then be prompted to select a room, a temperature unit (Celsius or Fahrenheit), your heat type (radiant or forced air), and system type (hot water, steam). Once all of this data is entered, you'll be asked to install the sensor, which is as easy as putting in the two included AAA batteries and pressing the pairing button. In my testing, the sensor was identified in around 20 seconds. I assigned the sensor to a room and followed the instructions to mount it about five feet from the floor away from air vents and out of direct sunlight. Next, I was prompted to connect the thermostat to my Wi-Fi. I tapped Get Connected, selected my Wi-Fi SSID, entered my password, and was connected within 25 seconds. I tapped Connect App, downloaded the app, created an account, and tapped Add Device. I selected the T9 from the list and waited around 10 seconds for the device to be recognized, at which point the thermostat screen displayed a four-digit code. I entered the code into the app and after 15 seconds or so the T9 was registered and the installation was complete. The T9 performed beautifully in our tests. It quickly responded to temperature changes using the touch screen and the mobile app, and it followed my heating schedules without issue. The remote room sensor followed the T9's target temperature to a tee and geofencing worked as advertised. Temperature and humidity alerts arrived instantly whenever a threshold was reached. Alexa voice commands also worked well. I had no trouble setting the T9 to a specific temperature target for a specific amount of time or starting a schedule using my voice, and Alexa always provided the current temperature when asked. My IFTTT applet to change the target temperature when a Ring camera detected motion worked fine, but there were no applet choices to have the thermostat trigger another device. For example, with the Ecobee Smart Thermostat, I was able to create an applet to have a smart plug turn on when the thermostat detected a certain humidity level (I had a dehumidifier plugged into the smart plug). There are no such trigger options offered on the Honeywell Home IFTTT channel, although a spokesperson has confirmed that more T9 trigger options will be added. Conclusions The Honeywell Home T9 Smart Thermostat With Sensor makes it easy to maintain uniform temperatures throughout your home. You can add up to 20 remote room sensors that can help reduce heating costs by telling the T9 if a room is occupied or unoccupied. The thermostat is easily controlled using Alexa, Cortana, or Google voice commands or from your phone using the Honeywell Home mobile app, but HomeKit support isn't yet available. While the T9 will work with other smart devices using IFTTT, applet choices are limited for now, but more will be added in the near future. If you can't wait for HomeKit compatibility and want a smart thermostat that does more than control your heating and cooling system, check out the Ecobee Smart Thermostat With Voice. It not only supports most of the popular voice platforms and is HomeKit ready, but it functions as an Amazon Alexa device that streams music, gives you the latest news, supports Alexa Calling and Messaging, and does everything that an Amazon Echo speaker does. It's also very easy to install and works with a host of other smart devices and home automation platforms. As such, it remains our Editors' Choice for smart thermostats. Honeywell Home T9 Smart Thermostat With Sensor Bottom Line: The Honeywell Home T9 Smart Thermostat is a dual-band Wi-Fi thermostat that uses long-range sensors to provide uniform temperatures throughout your home.

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