Compatibility at a glance
Choose your platform to see its setup and functions. Your choice carries across product pages.
A connection can work while individual controls or automations remain unconfirmed. Read the connection details ↓
Protocols: WIFI[1][20][23][31][41]
Before you buy
Follow the recorded connection below. Equipment details and setup limits explain what else this path needs.
Honeywell Home T9 Smart Thermostat
What you gainUse the recorded platform connection.
Keep in mindIntermediate equipment and transport are not mapped in this summary. Read the setup notes before choosing hardware. Check the function table for supported controls and routines. A connection diagram does not establish every function or remote access.
This shows the connection route, not every network cable or a shopping list. One device may provide several roles, including a Matter controller and a Thread border router. Only a Thread connection needs the Thread role. Read the equipment cards for all recorded requirements.
These paths summarize documented setup options. Check the function table for the connection covered by each recorded capability.
Apple Home can change setpoints but CANNOT see the T9's remote room sensors — the feature the product is named for and bought for. Resideo says so in its own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time', with only Alexa and Google able to view and control both. HomeKit itself was added by free firmware update (Nov 2021), so older press saying 'no HomeKit' is outdated — the limitation is about sensors, not about HomeKit support.[2][4][25][33]
The equipment list for this platform is not fully specified here. Use the documented setup above; an empty list does not mean no equipment is needed.
Follow the recorded connection below. Equipment details and setup limits explain what else this path needs.
Honeywell Home T9 Smart Thermostat
What you gainReach the device through the documented cloud connection.
Keep in mindCheck the function table for supported controls and routines. A connection diagram does not establish every function or remote access.
This shows the connection route, not every network cable or a shopping list. One device may provide several roles, including a Matter controller and a Thread border router. Only a Thread connection needs the Thread role. Read the equipment cards for all recorded requirements.
These paths summarize documented setup options. Check the function table for the connection covered by each recorded capability.
Resideo says Google Assistant can show and control both the thermostat and its room sensors. You connect it by linking your Honeywell Home account through Works with Google in the Google Home app.[9][25][33][39][46]
The equipment list for this platform is not fully specified here. Use the documented setup above; an empty list does not mean no equipment is needed.
Follow the recorded connection below. Equipment details and setup limits explain what else this path needs.
Honeywell Home T9 Smart Thermostat
What you gainReach the device through the documented cloud connection.
Keep in mindCheck the function table for supported controls and routines. A connection diagram does not establish every function or remote access.
This shows the connection route, not every network cable or a shopping list. One device may provide several roles, including a Matter controller and a Thread border router. Only a Thread connection needs the Thread role. Read the equipment cards for all recorded requirements.
These paths summarize documented setup options. Check the function table for the connection covered by each recorded capability.
Resideo says Alexa can show and control both the thermostat and its room sensors. You connect it by enabling the Honeywell skill in the Alexa app and signing in with your Resideo app account.[8][25][33][39][46]
The equipment list for this platform is not fully specified here. Use the documented setup above; an empty list does not mean no equipment is needed.
Follow the recorded connection below. Equipment details and setup limits explain what else this path needs.
Honeywell Home T9 Smart Thermostat
What you gainUse the recorded platform connection.
Keep in mindIntermediate equipment and transport are not mapped in this summary. Read the setup notes before choosing hardware. Check the function table for supported controls and routines. A connection diagram does not establish every function or remote access.
This shows the connection route, not every network cable or a shopping list. One device may provide several roles, including a Matter controller and a Thread border router. Only a Thread connection needs the Thread role. Read the equipment cards for all recorded requirements.
These paths summarize documented setup options. Check the function table for the connection covered by each recorded capability.
Cloud-linked service, and SmartThings can only change setpoints — it cannot see the T9's remote room sensors, which are the product's headline feature. Resideo's own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time.' The same limitation applies to Apple Home; only Alexa and Google can see the sensors.[2][10][25][26][33][35][43]
The equipment list for this platform is not fully specified here. Use the documented setup above; an empty list does not mean no equipment is needed.
Compare the documented setups and their requirements. Read each limit before choosing a route.
Honeywell Home T9 Smart Thermostat
What you gainReach the device through the documented account connection.
Keep in mindRequires a Resideo developer account and key. The connection depends on Resideo’s cloud.
Honeywell Home T9 Smart Thermostat
What you gainControl or read the device on your home network through the documented integration.
Keep in mindUse Home Assistant’s HomeKit Device integration for the documented local alternative. Check pairing and supported functions for this route.
Check the function table and setup notes for this route. An alternative connection does not inherit every capability of the recorded primary connection. A Thread border router, a Matter controller and a platform home hub are different roles; suitable hardware may provide more than one.
These paths summarize documented setup options. Check the function table for the connection covered by each recorded capability.
Home Assistant's built-in Honeywell Lyric integration names the T9 and covers temperature and heating and cooling mode, but neither Home Assistant nor Resideo says whether it can change the fan mode. It goes through Resideo's servers rather than your own network, and it needs a Resideo developer account and key that you register yourself first, which is real friction before anything works. The local alternative is to pair the thermostat through Home Assistant's HomeKit Controller integration instead.[3][5][21][22][34][40][42]
An Apple home hub (a HomePod or Apple TV), for Apple Home households only. Apple says a home hub is what lets you control accessories while you're away from home and automate them. Resideo's own app and the Alexa and Google links do not use it.[13][23][27][31][36][41][44]
One device can provide more than one role. These are setup requirements, not a shopping list of separate purchases.
What could you do with this?
Start with a documented control or event. The selected connection shows what is confirmed for that platform.
Apple Home · Partial
This device supports target temperature.
Setup: See the equipment information above.
Apple Home can change setpoints but CANNOT see the T9's remote room sensors — the feature the product is named for and bought for. Resideo says so in its own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time', with only Alexa and Google able to view and control both. HomeKit itself was added by free firmware update (Nov 2021), so older press saying 'no HomeKit' is outdated — the limitation is about sensors, not about HomeKit support.
Connection documentation: [2] [4] [25] [33]
Device documentation: [12] [20] [23] [31] [41]
honeywellhome.com · checked 2026-10-09
honeywellhome.com · checked 2026-10-02
Google Home · Works
This device supports target temperature.
Setup: See the equipment information above.
Resideo says Google Assistant can show and control both the thermostat and its room sensors. You connect it by linking your Honeywell Home account through Works with Google in the Google Home app.
Connection documentation: [9] [25] [33] [39] [46]
Device documentation: [12] [20] [23] [31] [41]
honeywellhome.com · checked 2026-10-09
honeywellhome.com · checked 2026-10-04
resideo.com · checked 2026-10-12
Alexa · Works
This device supports target temperature.
Setup: See the equipment information above.
Resideo says Alexa can show and control both the thermostat and its room sensors. You connect it by enabling the Honeywell skill in the Alexa app and signing in with your Resideo app account.
Connection documentation: [8] [25] [33] [39] [46]
Device documentation: [12] [20] [23] [31] [41]
honeywellhome.com · checked 2026-10-09
honeywellhome.com · checked 2026-10-04
resideo.com · checked 2026-10-12
SmartThings · Partial
This device supports target temperature.
Setup: See the equipment information above.
Cloud-linked service, and SmartThings can only change setpoints — it cannot see the T9's remote room sensors, which are the product's headline feature. Resideo's own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time.' The same limitation applies to Apple Home; only Alexa and Google can see the sensors.
Connection documentation: [2] [10] [25] [26] [33] [35] [43]
Device documentation: [12] [20] [23] [31] [41]
honeywellhome.com · checked 2026-10-09
honeywellhome.com · checked 2026-10-02
partners.smartthings.com · checked 2026-10-09
Home Assistant · Works; fan mode unconfirmed
This device supports target temperature.
Setup: See the equipment information above.
Home Assistant's built-in Honeywell Lyric integration names the T9 and covers temperature and heating and cooling mode, but neither Home Assistant nor Resideo says whether it can change the fan mode. It goes through Resideo's servers rather than your own network, and it needs a Resideo developer account and key that you register yourself first, which is real friction before anything works. The local alternative is to pair the thermostat through Home Assistant's HomeKit Controller integration instead.
Connection documentation: [3] [5] [21] [22] [34] [40] [42]
Device documentation: [12] [20] [23] [31] [41]
honeywellhome.com · checked 2026-10-09
home-assistant.io · checked 2026-10-09
home-assistant.io · checked 2026-07-15
A documented control or event is one part of a setup. It does not by itself establish a complete automation.
A platform connection does not confirm every function. Controls and reported events are shown separately from what an automation can use.
Compare all five platforms. On a narrow screen, scroll the table sideways.
| Device function | Apple HomePartial[2][4][25][33] | Google HomeWorks[9][25][33][39][46] | AlexaWorks[8][25][33][39][46] | SmartThingsPartial[2][10][25][26][33][35][43] | Home AssistantWorks; fan mode unconfirmed[3][5][21][22][34][40][42] |
|---|---|---|---|---|---|
| Target temperatureDevice control | Control Not stated | Control Not stated | Control Not stated | Control Not stated | Control Not stated |
| HVAC modeDevice control | Control Not stated | Control Not stated | Control Not stated | Control Not stated | Control Not stated |
| Fan modeDevice control | Control Not stated | Control Not stated | Control Not stated | Control Not stated | Control Not stated |
| Temperature readingReported event | Event Not stated | Event Not stated | Event Not stated | Event Not stated | Event Not stated |
| Humidity readingReported event | Event Not stated | Event Not stated | Event Not stated | Event Not stated | Event Not stated |
Automation availability for this model is not established.
✓ Documented for this connection. × A stated limit. ◐ A partial function. ? Not established. A listed device function does not establish a complete routine, its other equipment or any plan requirements.
Apple Home can change setpoints but CANNOT see the T9's remote room sensors — the feature the product is named for and bought for. Resideo says so in its own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time', with only Alexa and Google able to view and control both. HomeKit itself was added by free firmware update (Nov 2021), so older press saying 'no HomeKit' is outdated — the limitation is about sensors, not about HomeKit support.[2][4][25][33]
Resideo says Google Assistant can show and control both the thermostat and its room sensors. You connect it by linking your Honeywell Home account through Works with Google in the Google Home app.[9][25][33][39][46]
Resideo says Alexa can show and control both the thermostat and its room sensors. You connect it by enabling the Honeywell skill in the Alexa app and signing in with your Resideo app account.[8][25][33][39][46]
Cloud-linked service, and SmartThings can only change setpoints — it cannot see the T9's remote room sensors, which are the product's headline feature. Resideo's own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time.' The same limitation applies to Apple Home; only Alexa and Google can see the sensors.[2][10][25][26][33][35][43]
Home Assistant's built-in Honeywell Lyric integration names the T9 and covers temperature and heating and cooling mode, but neither Home Assistant nor Resideo says whether it can change the fan mode. It goes through Resideo's servers rather than your own network, and it needs a Resideo developer account and key that you register yourself first, which is real friction before anything works. The local alternative is to pair the thermostat through Home Assistant's HomeKit Controller integration instead.[3][5][21][22][34][40][42]
Platform documentation:
honeywellhome.com · checked 2026-10-02
honeywellhome.com · checked 2026-10-04
resideo.com · checked 2026-10-12
partners.smartthings.com · checked 2026-10-09
home-assistant.io · checked 2026-10-09
home-assistant.io · checked 2026-07-15
Listed device functions are established from vendor documentation. An ability missing here is unestablished, not necessarily absent.
| Ecosystem | Support | The catch |
|---|---|---|
| Amazon Alexa | WorksWorks with this ecosystem[8][25][33][39][46] | Resideo says Alexa can show and control both the thermostat and its room sensors. You connect it by enabling the Honeywell skill in the Alexa app and signing in with your Resideo app account. |
| Google Home | WorksWorks with this ecosystem[9][25][33][39][46] | Resideo says Google Assistant can show and control both the thermostat and its room sensors. You connect it by linking your Honeywell Home account through Works with Google in the Google Home app. |
| Apple Home | PartialPartial support — see the catch[2][4][25][33] | Apple Home can change setpoints but CANNOT see the T9's remote room sensors — the feature the product is named for and bought for. Resideo says so in its own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time', with only Alexa and Google able to view and control both. HomeKit itself was added by free firmware update (Nov 2021), so older press saying 'no HomeKit' is outdated — the limitation is about sensors, not about HomeKit support. |
| SmartThings | PartialPartial support — see the catch[2][10][25][26][33][35][43] | Cloud-linked service, and SmartThings can only change setpoints — it cannot see the T9's remote room sensors, which are the product's headline feature. Resideo's own words: 'HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time.' The same limitation applies to Apple Home; only Alexa and Google can see the sensors. |
| Home Assistant | Works; fan mode unconfirmedWorks; fan mode unconfirmed — see the catch[3][5][21][22][34][40][42] | Home Assistant's built-in Honeywell Lyric integration names the T9 and covers temperature and heating and cooling mode, but neither Home Assistant nor Resideo says whether it can change the fan mode. It goes through Resideo's servers rather than your own network, and it needs a Resideo developer account and key that you register yourself first, which is real friction before anything works. The local alternative is to pair the thermostat through Home Assistant's HomeKit Controller integration instead. |
✓ Works without a subscription: Yes.
Vendor account required: Not established — we have not sourced this yet.
No subscription for app control, sensors, or voice integrations
Alexa or Google households that want room-sensor comfort balancing at a clearance price and are comfortable buying an end-of-line product. Apple Home and SmartThings households should look elsewhere for this specific job — those platforms get setpoint control without the sensor readings the T9 exists to provide.
Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →
Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.
Your platform, exact hub and the functions you need determine the answer. A Setup Check researches how they fit together.