$79.99
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Updated November 2026
Data from the official Amazon and Honeywell Home sites.
2026 verdict
For a home where the bedroom never feels like the hallway reading, the Honeywell Home T9 Smart Thermostat is the better smart thermostat than the Amazon Smart Thermostat.
It includes a Smart Room Sensor that reports temperature, humidity and occupancy, so the system can heat the room in use instead of the wall it hangs on, and it works with Google Home, Alexa, Apple Home, SmartThings and Home Assistant. It also adds a color touchscreen, humidity sensing, temperature alerts, a system health monitor and a two-year warranty against one. The Amazon Smart Thermostat wins on price and nothing else: Alexa is its only confirmed platform, its display is a monochrome, non-touch LED, and it cannot use remote sensors. Pick the Amazon Smart Thermostat for a cheap, single-zone Alexa upgrade, and the Honeywell Home T9 Smart Thermostat for everything else.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Amazon Smart Thermostat | Honeywell Home T9 Smart Thermostat | Winner |
|---|---|---|---|
| Rating | 4.0 | 4.3 | Honeywell Home T9 Smart Thermostat |
| Warranty | 1 year | 2 years | Honeywell Home T9 Smart Thermostat |
| Integrations | Alexa | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Honeywell Home T9 Smart Thermostat |
| Sensors | Temperature | Proximity / Motion, Occupancy, Temperature, Humidity | Honeywell Home T9 Smart Thermostat |
| Alerts | None | Temperature Alerts | Honeywell Home T9 Smart Thermostat |
| System Health Monitor | NO | YES | Honeywell Home T9 Smart Thermostat |
| Power | None | C-Wire Required | Tie |
| Included accessories | Trim Plate | Temperature Sensor | Tie |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Screen | YES | YES | Tie |
| Energy Savings | YES | YES | Tie |
| Voice Control | YES | YES | Tie |
What the differences mean
Room sensors
The Honeywell Home T9 Smart Thermostat comes with a Smart Room Sensor that also detects occupancy, and you can add more to prioritise a bedroom or average several rooms. The Amazon Smart Thermostat supports no remote sensors, so every decision is made from the temperature at the wall.
Smart home platforms
Alexa is the only platform the Amazon Smart Thermostat is confirmed to work with. The Honeywell Home T9 Smart Thermostat works with Google Home, Alexa, Apple Home, SmartThings and Home Assistant, so it keeps working if the household ever changes assistant.
Display
The Honeywell Home T9 Smart Thermostat has a color touchscreen that shows the time and weather. The Amazon Smart Thermostat has a monochrome LED display with no touch control that shows the temperature only.
Sensing and alerts
The Honeywell Home T9 Smart Thermostat measures humidity, detects presence, sends temperature alerts and monitors the system. The Amazon Smart Thermostat measures temperature alone and sends no alerts.
Warranty and trim plate
Honeywell covers the T9 for two years and Amazon its thermostat for one. The Amazon Smart Thermostat does include a trim plate to cover the marks of an old thermostat, which the Honeywell Home T9 Smart Thermostat does not.
Which one to buy if
- a bedroom or home office runs colder than the rest of the house
The Honeywell Home T9 Smart Thermostat can hold that room at the temperature you want with its included sensor.
- your home runs on Apple Home, Google Home or SmartThings
The Honeywell Home T9 Smart Thermostat works with all three; the Amazon Smart Thermostat is Alexa only.
- you want the cheapest way to add Alexa voice control to one heating zone
The Amazon Smart Thermostat does schedules and Alexa control at the lowest cost, which is all it tries to do.
- the old thermostat left marks on the wall
The Amazon Smart Thermostat includes a trim plate; the Honeywell Home T9 Smart Thermostat does not.
$79.99
- - Rating: 4.0 vs 4.3
- - Warranty: 1 year vs 2 years
Winner
- + Rating: 4.3
- + Warranty: 2 years
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors
What owners say
Honeywell Home T9 Smart Thermostat owners say the room sensors deliver what the box promises: the thermostat works out which room is occupied and heats to it, and several chose it after trying other smart thermostats and rate it the one that finally clicked, with Apple Home pairing a recurring reason. Installation earns steady praise, since the C-wire adapter is in the box and a replacement for an older Honeywell often fits the existing wall plate. The complaints are about software and batteries rather than the hardware: the Resideo app is described as capable but fiddly, changing the temperature from the phone sets a permanent hold that overrides the schedule, and a sensor can go through its batteries quickly.
Frequently Asked Questions
Which is better: Amazon Smart Thermostat or Honeywell Home T9 Smart Thermostat?
The Honeywell Home T9 Smart Thermostat. It includes a room sensor with occupancy detection, works with every major smart home platform, has a color touchscreen and humidity sensing, and carries a two-year warranty. The Amazon Smart Thermostat is cheaper but Alexa only and far more basic.
What is the biggest difference between the Amazon Smart Thermostat and the Honeywell T9?
Room sensors. The Honeywell Home T9 Smart Thermostat ships with a Smart Room Sensor and can follow the occupied room, while the Amazon Smart Thermostat supports no remote sensors and only reads the temperature where it is mounted.
Does the Honeywell Home T9 work with Alexa like the Amazon Smart Thermostat?
Yes. The Honeywell Home T9 Smart Thermostat works with Alexa and also with Google Home, Apple Home, SmartThings and Home Assistant. The Amazon Smart Thermostat is confirmed only for Alexa.
Who should buy the Amazon Smart Thermostat?
Alexa households with a single heating zone that want basic scheduling and voice control for the least money, and do not need remote sensors, humidity readings or a touchscreen.
Who should buy the Honeywell Home T9 Smart Thermostat?
Homes with rooms that heat unevenly, households that want the system to follow which rooms are occupied, and anyone on Apple Home, Google Home or SmartThings.
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