Also sold in packs
- Pack of 2$359.98$179.99 per unitBuy
Data from the official Honeywell Home site.
2026 verdict
If your thermostat sits in a hallway nobody spends time in, the Honeywell Home T9 Smart Thermostat is the better Honeywell smart thermostat of these two.
It ships with a Smart Room Sensor that works up to 200 ft away, follows occupied rooms or holds a chosen room at temperature, adds Apple HomeKit to Google Home, Alexa, SmartThings and Home Assistant, and doubles the warranty to two years. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat answers with a customisable full-colour touchscreen, monthly energy reports with tips and a longer track record, and it is the cheaper of the two. Both measure humidity, send temperature alerts, remind you about filters and run on 2.4 GHz Wi-Fi only, and neither supports Matter. Pick the T9 for room-by-room comfort or an Apple home, and the RTH9585WF for a single-zone home that wants a big readable screen.
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat | Honeywell Home T9 Smart Thermostat | Winner |
|---|---|---|---|
| Warranty | 1 year | 2 years | Honeywell Home T9 Smart Thermostat |
| Included accessories | None | Temperature Sensor | Honeywell Home T9 Smart Thermostat |
| Integrations | Google Home, Alexa, Samsung SmartThings, Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Honeywell Home T9 Smart Thermostat |
| Sensors | Temperature, Humidity | Proximity / Motion, Occupancy, Temperature, Humidity | Honeywell Home T9 Smart Thermostat |
| Local Control | NO | YES | Honeywell Home T9 Smart Thermostat |
| Rating | 4.3 | 4.3 | Tie |
| Power | None | C-Wire Required | Tie |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Screen | YES | YES | Tie |
| Alerts | Temperature Alerts | Temperature Alerts | Tie |
| Energy Savings | YES | YES | Tie |
| System Health Monitor | YES | YES | Tie |
What the differences mean
Room sensors
The Honeywell Home T9 Smart Thermostat includes one Smart Room Sensor, supports more, and can prioritise a bedroom or follow occupancy. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat does not support remote sensors, so it only knows the temperature where it hangs.
Apple Home
The T9 works with Apple HomeKit; the RTH9585WF does not. Both cover Google Home, Alexa, SmartThings and Home Assistant.
Screen
The RTH9585WF has a full-colour touchscreen whose background you can match to the wall, with outdoor conditions and forecasts. The T9 also has a touchscreen, and the catalog does not list it as a colour one.
Energy tips
The RTH9585WF sends monthly home energy reports with personalised suggestions. The T9 instead leans on geofenced Home and Away scheduling and its room sensors to avoid wasted heating.
Warranty
Two years on the Honeywell Home T9 Smart Thermostat against one year on the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat.
Which one to buy if
- a bedroom or home office never reaches the right temperature
The T9 can hold that room at temperature using the sensor included in the box.
- your home runs on Apple Home
Only the Honeywell Home T9 Smart Thermostat works with HomeKit.
- you want a large colour screen that matches your wall
The RTH9585WF has a customisable full-colour touchscreen with indoor and outdoor readouts.
- your home heats evenly and you want to spend less
The RTH9585WF is the cheaper unit and sensors would add little in a single-zone home.
- - Warranty: 1 year vs 2 years
- - Included accessories: None vs Temperature Sensor
Winner
- + Warranty: 2 years
- + Included accessories: Temperature Sensor
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors
What owners say
Owners of both Honeywell models describe a solid thermostat let down at times by the Resideo app and cloud. Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat owners stress longevity, many having replaced Nest units that failed, and praise the colour screen with its outdoor temperature and humidity readout and installs of a few minutes; their complaints are Resideo server outages, remote features that are effectively US-only and a fixed one-degree differential. Honeywell Home T9 Smart Thermostat owners single out the room sensors correctly finding the occupied room, HomeKit pairing and the C wire adapter in the box. Their gripes are sensor batteries that can drain fast, a Wi-Fi adjustment that sets a permanent hold over the schedule and an averaging mode that slips back to the schedule overnight.
Frequently Asked Questions
Which one is better: Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat or Honeywell Home T9 Smart Thermostat?
The Honeywell Home T9 Smart Thermostat for most homes. It adds an included room sensor with occupancy detection, Apple HomeKit support and a two year warranty. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat is the cheaper choice with a customisable colour screen.
What is the biggest difference between the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat and the Honeywell Home T9 Smart Thermostat?
Room sensing. The Honeywell Home T9 Smart Thermostat uses Smart Room Sensors up to 200 ft away to follow occupied rooms, while the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat reads only the temperature at the wall.
Do the Honeywell Home RTH9585WF and T9 work with Apple Home?
Only the Honeywell Home T9 Smart Thermostat does. The Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat works with Google Home, Alexa, SmartThings and Home Assistant but not Apple HomeKit, and neither supports Matter.
Do both Honeywell thermostats use the same app?
Both are Resideo products, and owners of the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat and the Honeywell Home T9 Smart Thermostat alike mention app and cloud hiccups while the thermostat itself keeps running its schedule.
Who should buy the Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat?
Single-zone homes that want a proven thermostat with a big customisable colour screen, energy reports and Google Home or Alexa control, and do not need HomeKit or room sensors.
Who should buy the Honeywell Home T9 Smart Thermostat?
Homes with rooms that heat unevenly, Apple Home or SmartThings households, and anyone who wants to prioritise a bedroom at night.
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