Winner
Updated October 2026
Data from Amazon and official Honeywell Home and Sensi sites.
2026 verdict
When one room has to be held at the right temperature, the Honeywell Home T9 Smart Thermostat is the smart thermostat that beats the Sensi Smart thermostat, and it also reaches Apple Home.
Winner
Honeywell Home T9 Smart ThermostatLast recorded priceOct 6, 2026$209.00
Currently unavailable on Amazon USA
Its included Smart Room Sensor works up to 200 feet away, detects which rooms are occupied and lets you prioritise one, and the T9 adds temperature alerts, filter and maintenance reminders and a touchscreen. The Sensi Smart thermostat is the cheaper, simpler unit with a wide 5 inch monochrome display, a better owner rating and the longer warranty at three years against two. Both work with Google Home, Alexa, SmartThings and Home Assistant, both read humidity and both stay on 2.4 GHz Wi-Fi without Matter, and only the T9 works with Apple HomeKit. Choose the Honeywell Home T9 Smart Thermostat for multi-room comfort or Apple Home, and the Sensi Smart thermostat for a single-zone home that wants the other platforms for less.
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| Feature | Honeywell Home T9 Smart Thermostat | Sensi Smart thermostat | Winner |
|---|---|---|---|
| Rating | 4.3 | 4.4 | Sensi Smart thermostat |
| Warranty | 2 years | 3 years | Sensi Smart thermostat |
| Included accessories | Temperature Sensor | None | Honeywell Home T9 Smart Thermostat |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Google Home, Alexa, Samsung SmartThings, Home Assistant | Honeywell Home T9 Smart Thermostat |
| Sensors | Proximity / Motion, Occupancy, Temperature, Humidity | Temperature, Humidity | Honeywell Home T9 Smart Thermostat |
| Alerts | Temperature Alerts | None | Honeywell Home T9 Smart Thermostat |
| System Health Monitor | YES | NO | Honeywell Home T9 Smart Thermostat |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Screen | YES | YES | Tie |
| Energy Savings | YES | YES | Tie |
| Voice Control | YES | YES | Tie |
| Speaker | NO | NO | Tie |
What the differences mean
Room sensors
The Honeywell Home T9 Smart Thermostat includes a Smart Room Sensor with up to 200 feet of range and can follow occupied rooms or hold one room at temperature. The Sensi Smart thermostat supports no external sensors.
Alerts and maintenance
The T9 warns you about temperature extremes and reminds you when the filter is due. The Sensi Smart thermostat has neither, so those checks stay on your calendar.
Display
A touchscreen on the T9, against a wider 5 inch monochrome display with physical controls on the Sensi Smart thermostat, which is easy to read from a distance but not to navigate.
Warranty
The Sensi Smart thermostat carries three years of warranty, one more than the two years on the Honeywell Home T9 Smart Thermostat.
Platform support
Only the Honeywell Home T9 Smart Thermostat works with Apple HomeKit; the Sensi Smart thermostat does not. Both cover Google Home, Alexa, SmartThings and Home Assistant.
Which one to buy if
- a bedroom needs to be comfortable at night regardless of the hallway
The T9 can prioritise that room using its included sensor.
- you want reminders for filter changes
The Honeywell Home T9 Smart Thermostat has filter and maintenance reminders; the Sensi does not.
- your home heats evenly and you want to keep the cost down
The Sensi Smart thermostat covers Google Home, Alexa, SmartThings and Home Assistant for less, with a longer warranty.
- you would rather not replace sensor batteries
The Sensi Smart thermostat uses no remote sensors, and T9 owners report short sensor battery life.
Winner
- + Included accessories: Temperature Sensor
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors
- + Sensors: Proximity / Motion, Occupancy, Temperature, Humidity
- - Rating: 4.3 vs 4.4
- - Warranty: 2 years vs 3 years
24% OFF
$98.98
$129.99
- + Rating: 4.4
- + Warranty: 3 years
- - Included accessories: None vs Temperature Sensor
- - Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors
What owners say
Honeywell Home T9 Smart Thermostat owners say the sensors deliver: the thermostat works out which room is occupied and heats to it, and several chose it after Nest dropped third-party automation support. Installation earns praise too, with the C wire adapter in the box and the new unit often fitting an older Honeywell wall plate, and HomeKit pairing is repeatedly named as what makes it click. The complaints centre on the Resideo app, which owners call capable but fiddly, on a Wi-Fi adjustment that sets a permanent hold over the schedule, and on sensor batteries that can drain within weeks. Sensi Smart thermostat owners describe a guided self-install, physical buttons, easy schedules and fan circulation settings, but note the app's US and Canadian address requirement and occasional Wi-Fi drops.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Honeywell Home T9 Smart Thermostat
- Sensi Smart thermostat
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Frequently Asked Questions
Sensi vs Honeywell thermostat: which is better, the Honeywell Home T9 Smart Thermostat or the Sensi Smart thermostat?
The Honeywell Home T9 Smart Thermostat, for its included room sensor, occupancy detection, alerts and maintenance reminders. The Sensi Smart thermostat is the cheaper choice with a longer warranty and every platform except Apple HomeKit.
What is the biggest difference between the Honeywell Home T9 Smart Thermostat and the Sensi Smart thermostat?
Room sensing. The Honeywell Home T9 Smart Thermostat uses Smart Room Sensors up to 200 feet away to heat occupied rooms, while the Sensi Smart thermostat reads only the temperature at the wall.
Do the Honeywell Home T9 Smart Thermostat and the Sensi Smart thermostat work with Apple Home, Google Home and Alexa?
Both work with Google Home, Alexa, SmartThings and Home Assistant, but only the Honeywell Home T9 Smart Thermostat works with Apple HomeKit; the Sensi Smart thermostat does not. Neither supports Matter.
Which has the longer warranty, the Honeywell Home T9 Smart Thermostat or the Sensi Smart thermostat?
The Sensi Smart thermostat, with three years, against two years on the Honeywell Home T9 Smart Thermostat.
Who should buy the Honeywell Home T9 Smart Thermostat?
Homes with uneven rooms, parents who want a bedroom held at temperature, and HomeKit or SmartThings households replacing an older Honeywell.
Who should buy the Sensi Smart thermostat?
Single-zone homes that want a straightforward thermostat with Google Home, Alexa, SmartThings and Home Assistant support, humidity readings and a three year warranty.
Full comparison table
Compare all 23 Thermostats side by side
You are looking at two of them. The full table lines up all Thermostats in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 23 Thermostats
- 51 specs compared
- 47 filters
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Unavailable
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Unavailable
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$79.00
Honeywell HomeRTH9585WF Wi-Fi Smart Color Thermostat
31% OFF$179.99$123.49- Honeywell Home
T9 Smart Thermostat
Last priceOct 6, 2026$209.00
Unavailable 
Honeywell HomeT5 Smart Thermostat
30% OFF$109.99$77.00
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$186.99
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$120.85
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$139.99
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Unavailable
Honeywell HomeX8S Smart Thermostat
6% OFF$259.99$245.00
- ThermostatsHoneywell Home
RTH9585WF Wi-Fi Smart Color Thermostat
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T5 Smart Thermostat
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T9 Smart Thermostat
4.3(2,982)Last priceOct 6, 2026$209.00
Unavailable - ThermostatsHoneywell Home
X2S Smart Thermostat
4.2(415)27% OFF$84.99$61.91 - ThermostatsHoneywell Home
X7S Smart Thermostat
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X8S Smart Thermostat
4.1(152)6% OFF$259.99$245.00 
Water Leak SensorsHoneywell HomeL1 WiFi Water Leak and Freeze Detector
3.7(71)$68.00
Temperature & Humidity SensorsSensiEmerson Room Sensor
4.3(357)$45.88
ThermostatsSensiLite smart thermostat
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Smart thermostat
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Touch 2 smart thermostat
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Touch smart thermostat
4.5(14,220)Last priceAug 28, 2026$159.99
Unavailable