A temperature that's 'just right'.
Every night.

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T9 Smart Thermostat

Welcome to 'Just Right'

Sense the temperatures in the rooms you care about most. Focus on the rooms you choose as a part of your set schedule, or allow comfort to go where you go as you move about your home. Then, help save energy when you leave.

Smart Sensors, Smart Living

Place Smart Room Sensors where you want to see each room's temperature and humidity. Use the multi-room display on the thermostat's touchscreen or in the app to easily focus on rooms either based on their occupancy or according to a specific schedule you choose.

When focused on multiple rooms, the T9 will work towards creating an average temperature, balancing the needs across the whole home.

Purchase the T9 bundled with a sensor, and expand the system by adding up to 20 additional sensors.

“The best range I’ve seen in this class of product.”

– TechHive April 2019

Whole Home* Coverage

Our sensors have a stronger signal that can reach up to 200 feet and penetrate further and deeper across the whole home. This also means the quality of the signal and data presented to the T9 is increased, allowing for greater learning and control. Thick walls and flooring can't stand between you and home comfort.

*Range can vary depending on your Home’s construction, wireless interference, and other factors

Help Everyone Sleep Comfortably

Focus your T9 Smart Thermostat on specific rooms, such as bedrooms, to help you get a cozy night's sleep.

Requires Smart Room Sensor per monitored area.

People Detection

With Smart Room Sensors, the T9 can know which rooms are in use so it can automatically focus on them. Intelligent motion detection algorithms help it tell the difference between someone passing through or spending time in a room, so your ideal comfort can efficiently follow you and your family from room to room over the course of your day. So, if the kids are doing homework or playing while you get dinner ready, everyone will be cozy - and when it’s time to gather, it can keep up.

Multi-Room Focus

Focus the temperature on multiple rooms for comfort where it matters most. Don’t guess at the right temperature in the hallway to make your bedroom comfortable enough to sleep. Get the comfort you want, where you want it – to sleep, work, focus, or unwind.

Comfort when Home, Savings when Away

With the Honeywell Home app, using geofencing the T9 knows when you're coming and going, so no matter your schedule, you can always come home to comfort and save energy when you're away.

Smart Response® & Alerts

The T9 learns your home's heating and cooling cycles to help deliver the optimal temperature at the right time. Plus you can be alerted when it's time to change your filters and when temperatures get too high or low.

Smart Home Integration

It's easy to incorporate the T9 into your home system. Our partners integrate through the Works with Honeywell Home program so you can control your devices the way you want.

See what works with Honeywell Home


Shop the T9 Smart Thermostat

The T9 is available bundled with one smart room sensor or as a thermostat only. Additional smart room sensors are also available to extend comfort to any room in your home.


T9 Smart Thermostat

with Smart Room Sensor

  • Color Graphical LCD touchscreen display
  • Location-based temperature control
  • 7-day scheduling
  • Distributed Comfort
  • Auto change from heat to cool
  • Indoor humidity sensing
  • 200-foot* sensor range
  • Occupancy detection on sensors
  • Works with Amazon Echo, Google Assistant, and more
  • ENERGY STAR® Certified
  • Supports Wi-Fi 802.11 B/G/N 2.4 and 5 GHz
  • Multi-room display
  • Thermostat dimensions: 3.7" x 4.92" x 0.94"
  • Smart Room Sensor dimensions: 2.6" x 2.6" x 0.77"
  • 2-year warranty



Save with Utility Rebate Programs

Your utility may offer rebate programs that reward you for helping save energy. You can earn rebates for simply buying and enrolling your T9 Smart Thermostat. Once enrolled, you make a positive environmental impact while helping to lower your energy bill, earning even more savings.

Explore local savings

Manage your Honeywell Home devices in one easy-to-use app, making it simple to control home comfort, monitor usage, and more - from anywhere.

Worry less. You’ll get alerts if the temperature rises or drops outside of your threshold and get reminders to change your air filter. Plus, your thermostat will switch to your preferred ‘away’ temperature when you leave - automatically.

Try app demo

Is Your Home Compatible?

Let's do a quick check to see which Honeywell Home Thermostats will work with your home's system.

Upgrades Made Simple

T9 upgrade

If you currently have a Honeywell Home T-Series thermostat, your wiring may already be set to install the T9. Thanks to their shared wall mount, replacing an old T-Series thermostat with a new T9 is as simple as snap-off, snap-on. If you don't have a C-Wire, there's even an included adapter to cover that.

Find Your Home Comfort Match.

We offer several smart thermostat options - find one that will suit your needs.

APPLE HOMEKIT Coming 2019 Yes
Eligibility for Utility Rebates Yes Yes
APP Honeywell Home Honeywell Home
DIMENSIONS 3.7" x 4.92" x 0.94" 4.1" x 4.1" x 1.1"
MSRP $199.99 $149.99

*All Smart T-Series thermostats require a c-wire. The T9 and T5+ come with a c-wire adapter. A professional can add a c-wire (or utilize a c-wire adapter) for the T10 Pro Smart and the T6 Pro Smart thermostats, if one doesn’t exist.

Connect Your Home

The T9 Smart Thermostat is a part of the Honeywell Home connected family, which offers heating and cooling control, water leak detection, and security. Control your Honeywell Home devices from anywhere on your smartphone or tablet, ensuring your home is just how you like it.

Smart Home

Learn More »

C1 Wi-Fi Security Camera

Learn More »

C2 Wi-Fi Security Camera

Learn More »

Wi-Fi Water Leak & Freeze Detector

Learn More »

Getting Started

Hi, we're here to help get you started with your new T9 Smart Thermostat. Have you completed installation yet?

No problem, we can help you out with that!
If you need some guidance, our install guide will help you through the process. Alternately, you can also find an authorized professional near you to complete your installation.

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Connecting to Wi-Fi

Here are some tips to help you get connected to your Wi-Fi network quickly and easily.

  • Make sure your thermostat is on the same Wi-Fi network as your mobile device.
  • Check that your Wi-Fi router has your 2.4 and 5GHz bands separated, not combined. You’ll want to connect to one, not both, of these bands.
  • Make sure the Wi-Fi router is set for DHCP, No Static Networks. Refer to your router support or Internet Service Provider for assistance.

Check for more tips here.

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Personalizing Sensor Setup

Here are some guidelines that will help your Smart Room Sensors work their best.

  • Placement: 5 feet off the floor, away from heat and away from windows. If you hide a sensor, it won’t be able to detect motion, so make sure it’s visible to prioritize based on occupancy.
  • Prioritization: You can prioritize a room from the thermostat or app by selecting it. When outlined in green, that sensor has been prioritizied. You can select more than one to average those spaces, or select all sensors to average the whole home.
  • Rooms: It is recommended to put one sensor in each sleeping and living area. You spend a third of your life in your bedroom,, so doesn’t it deserve comfort control?
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Activating People Detection (Motion-Detected Comfort)

It’s quick and easy to switch your thermostat to prioritize comfort in the rooms people are in.

  • Select your thermostat from your app dashboard if you’re on your mobile device.
  • Select Priority, and then select Active Rooms.
  • You can still arrange a sleep schedule separately, so bedrooms will stay prioritized overnight without any motion.
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Prioritizing the Bedroom

It’s easy to tell the T9 to prioritize comfort in any room you like.

  • Select your thermostat from your app dashboard if you’re on your mobile device.
  • Select Priority, and then choose Selected Rooms.
  • Tap the sensor located in the room you’d like to prioritize, so that it’s outlined in green.
  • You can tap additional rooms, too - the T9 will average comfort across all selected rooms in this mode.
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Checking Temperature and Humidity

You can check on your comfort readings any time you like with the Honeywell Home app.

  • Select your thermostat from your app dashboard if you’re on your mobile device.
  • Select the settings icon.
  • Select Devices and Sensors, and current readings will be displayed for all Smart Room Sensors.
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Setting up Auto Home & Away

When you set up geofencing, your T9 can automatically change modes as you come and go.

  • In the Honeywell Home app on your mobile device, select Menu.
  • Select Geofence.
  • On Geofence this Location, change the setting to on.
  • If you are prompted to share your location, follow the prompt to allow this permission. If applicable, ensure that your location is shared Always, rather than While Using the App.
  • Once your location is shared, you will be able define the parameters of your geofence by selecting Geofence Radius, and save this setting.
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Integrating with Your Smart Home

The T9 is compatible with a wide array of smart home ecosystems. Select yours for more information on how to get connected.

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