Honeywell
Honeywell T9 thermostat
Thermostats · Climate
Mixed reportsWorks in Apple HomeLocal
4 reports: 2 say it works, 2 say it partly works.
Reported on r/homeassistant with HomeKit, HomeKit Controller, HomeKit Device.
What people report
| Integration | In Home Assistant | In Apple Home | What they said | Source |
|---|---|---|---|---|
| HomeKit | Works | Works in Home HomeKit compatible and works for user | HomeKit compatible, works perfectlySaved copyMy house (new build) came with a Honeywell T9 which is Homekit compatible. Works perfectly for my needs Excerpt saved from the Arctic Shift Reddit archive on 2026-10-23. | Reddit comment · 2025-05 |
| HomeKit Controller | Works Local | Supports HomeKit so can be used locally or via HomebridgeSaved copyNot sure if you’ve looked at Honeywell at all but my T9 is doing great in HA and none of those api issues https://amzn.to/3KmNCtZ Excerpt saved from the Arctic Shift Reddit archive on 2026-10-23. | Reddit comment · 2025-10 | |
| HomeKit Device | Partly works Local | Multi-zone via HomeKit but fan control not exposed to HASaved copyI have a Honeywell t9. It does multiple zones, and uses homekit. It unfortunately does not expose fan control to ha. Excerpt saved from the Arctic Shift Reddit archive on 2026-10-23. | Reddit comment · 2025-06 | |
| HomeKit Device | Partly works Local | Partly in Home Reachable via HomeKit; HA cannot control fan mode | HA cannot control fan modeSaved copyJust to mention 2 issues I have with my Honeywell T9's (not sure if these are present with other models). First, HA can't control the fan mode, which is something I'd love to automate because I like to mix air between the hot south part of the house and the cold north side, but I can only do it with the resideo app or schedule. Second, there's a weird bug with the Honeywell integration where setting the temp in F sometimes causes the set temp to drop one degree. It's mentioned in github, I think someone thinks its related to conversion from C and rounding or something? Been awhile since I … Excerpt saved from the Arctic Shift Reddit archive on 2026-10-23. | Reddit comment · 2026-03 |
Each row is one report from a GitHub thread, an integration’s docs, or r/homeassistant. Check the date and the linked source before you buy.
In ReReHome
Once Home Assistant’s HomeKit Bridge shares it, this device reaches Apple Home as a HomeKit accessory behind your Home Assistant bridge, so ReReHome shows and controls it like any other.
Identifiers
| Brand | Honeywell |
|---|---|
| Model | T9 |
| Category | Thermostats |