Winner
Updated November 2026
Data from the official Google and Honeywell Home sites.
2026 verdict
Owners who want the thermostat to write its own schedule, in a home moving to Matter, should buy the Nest Learning Thermostat (4th gen) rather than the Honeywell Home T9 Smart Thermostat.
The Nest adds Matter, 5 GHz Wi-Fi and Bluetooth, an ambient light sensor, schedule suggestions and a sharp 2.7 inch colour display, and it includes a trim plate. The Honeywell Home T9 Smart Thermostat is the cheaper of the two and answers with a touchscreen, a built-in speaker, native HomeKit and full Home Assistant support, where the Nest joins Apple Home through Matter and Home Assistant only partially. Both ship with a room sensor, detect occupancy, read humidity, send temperature alerts, monitor system health and carry a two year warranty. Pick the Nest Learning Thermostat (4th gen) for learning and Matter, and the T9 for a touchscreen, Home Assistant or a lower price.
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| Feature | Google Nest Learning Thermostat (4th gen) | Honeywell Home T9 Smart Thermostat | Winner |
|---|---|---|---|
| Rating | 4.4 | 4.3 | Google Nest Learning Thermostat (4th gen) |
| Power | None | C-Wire Required | Honeywell Home T9 Smart Thermostat |
| Included accessories | Trim Plate, Temperature Sensor | Temperature Sensor | Google Nest Learning Thermostat (4th gen) |
| Connectivity | 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth | 2.4 GHz WiFi | Google Nest Learning Thermostat (4th gen) |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter, External Temperature Sensors | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Google Nest Learning Thermostat (4th gen) |
| Sensors | Proximity / Motion, Occupancy, Temperature, Humidity, Ambient Light | Proximity / Motion, Occupancy, Temperature, Humidity | Google Nest Learning Thermostat (4th gen) |
| Warranty | 2 years | 2 years | Tie |
| Screen | YES | YES | Tie |
| Alerts | Temperature Alerts | Temperature Alerts | Tie |
| Energy Savings | YES | YES | Tie |
| System Health Monitor | YES | YES | Tie |
| Voice Control | YES | YES | Tie |
What the differences mean
Learning and suggestions
Both schedule automatically, but the Nest Learning Thermostat (4th gen) learns the temperatures you like and suggests schedule tweaks. The T9 relies on geofenced Home and Away and its sensors instead of suggestions.
Matter and Apple Home
The Nest supports Matter, which is also how it joins Apple Home. The T9 has native HomeKit support but no Matter. Both work with Google Home, Alexa and SmartThings.
Screen and controls
The Nest has a high resolution 2.7 inch colour display controlled by a dial. The Honeywell Home T9 Smart Thermostat has a touchscreen, which the catalog does not list as a colour one.
Home Assistant
The T9 has full Home Assistant support through the official Honeywell integration; the Nest Learning Thermostat (4th gen) only partial.
Wi-Fi
The Nest connects on 2.4 or 5 GHz and has Bluetooth. The T9 is 2.4 GHz only, and one owner had trouble with a mesh router.
Which one to buy if
- you never want to program a schedule
The Nest Learning Thermostat (4th gen) learns your routine and suggests adjustments.
- your smart home runs on Matter or Google Home
The Nest supports Matter and lives in the Google Home app.
- you automate with Home Assistant
The Honeywell Home T9 Smart Thermostat has full Home Assistant support.
- you are swapping out an older Honeywell
T9 owners report it often fits the existing Honeywell wall plate, with a C wire adapter included.
Winner
21% OFF
$219.99
$279.99
- + Rating: 4.4
- + Included accessories: Trim Plate, Temperature Sensor
- + Connectivity: 2.4 GHz WiFi, 5 GHz WiFi, Bluetooth
- - Power: None vs C-Wire Required
- + Power: C-Wire Required
- - Rating: 4.3 vs 4.4
- - Included accessories: Temperature Sensor vs Trim Plate, Temperature Sensor
What owners say
Owners of both thermostats say the included room sensor delivers, letting the system favour the rooms people actually use. Nest Learning Thermostat (4th gen) owners single out the learning, which adjusts around their comings and goings without a manual schedule, the large animated display and the maintenance band that curbs compressor short-cycling. Honeywell Home T9 Smart Thermostat owners single out HomeKit pairing, the C wire adapter in the box and a unit that often fits an older Honeywell wall plate. The complaints differ: Nest owners report power failures without a dedicated C wire and being limited to the Google Home app, while T9 owners report a fiddly Resideo app, Wi-Fi adjustments that set a permanent hold and sensor batteries that can drain quickly.
Frequently Asked Questions
Nest vs Honeywell: which is better, the Nest Learning Thermostat (4th gen) or the Honeywell Home T9 Smart Thermostat?
The Nest Learning Thermostat (4th gen), for its learning schedule with suggestions, Matter support, dual band Wi-Fi and a sharper display. The Honeywell Home T9 Smart Thermostat is cheaper and adds a touchscreen, a speaker and full Home Assistant support.
Do both come with a room sensor?
Yes. The Nest Learning Thermostat (4th gen) includes a Nest temperature sensor and the Honeywell Home T9 Smart Thermostat includes one Smart Room Sensor. Both detect occupancy.
Does the Honeywell Home T9 Smart Thermostat work with Google Home?
Yes. The Honeywell Home T9 Smart Thermostat works with Google Home, Alexa, Apple HomeKit, SmartThings and Home Assistant. The Nest Learning Thermostat (4th gen) also works with Google Home, Alexa and SmartThings and adds Matter.
Which has the better warranty?
Neither. The Nest Learning Thermostat (4th gen) and the Honeywell Home T9 Smart Thermostat both have a two year warranty.
Who should buy the Nest Learning Thermostat (4th gen)?
Google and Matter households that want a self-learning thermostat with a room sensor and a premium display.
Who should buy the Honeywell Home T9 Smart Thermostat?
Home Assistant users, owners replacing an older Honeywell and buyers who want a touchscreen and native HomeKit at a lower price.
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