Updated November 2026
Data from the official Ecobee and Honeywell Home sites.
2026 verdict
For a home where one room never matches the hallway, the Honeywell Home T9 Smart Thermostat is the pick among these two.
It ships one wireless Smart Room Sensor good for up to 200 feet, reads temperature and humidity and detects occupancy so the system can follow the rooms in use, and it works with Apple HomeKit, Alexa, Google Home, SmartThings and Home Assistant. The Ecobee Smart Thermostat Essential counters with a lower price, a 3 year warranty, Bluetooth on top of Wi-Fi and temperature alerts, but its SmartSensors are sold separately and it has no occupancy sensing of its own. Pick the Honeywell for room-by-room prioritisation out of the box and the Ecobee for a lower-cost, multi-platform thermostat.
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| Feature | Ecobee Smart Thermostat Essential | Honeywell Home T9 Smart Thermostat | Winner |
|---|---|---|---|
| Rating | 4.2 | 4.3 | Honeywell Home T9 Smart Thermostat |
| Warranty | 3 years | 2 years | Ecobee Smart Thermostat Essential |
| Included accessories | None | Temperature Sensor | Honeywell Home T9 Smart Thermostat |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi | Ecobee Smart Thermostat Essential |
| Sensors | Proximity / Motion, Temperature, Humidity | Proximity / Motion, Occupancy, Temperature, Humidity | Honeywell Home T9 Smart Thermostat |
| Alerts | Temperature Alerts, Intrude Alerts | Temperature Alerts | Ecobee Smart Thermostat Essential |
| System Health Monitor | NO | YES | Honeywell Home T9 Smart Thermostat |
| Power | C-Wire Required | C-Wire Required | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors | Tie |
| Screen | YES | YES | Tie |
| Energy Savings | YES | YES | Tie |
| Voice Control | YES | YES | Tie |
What the differences mean
Included room sensor
The Honeywell Home T9 Smart Thermostat ships one Smart Room Sensor in the box, rated for up to 200 feet, so room prioritisation works on day one. The Ecobee Smart Thermostat Essential includes no sensor at all, and its SmartSensors have to be bought separately before it can balance rooms.
Occupancy sensing
The Honeywell Home T9 Smart Thermostat detects occupancy through its room sensors, so it can heat or cool the room that is actually in use. The Ecobee Smart Thermostat Essential has only a proximity sensor that wakes the screen, with no occupancy channel of its own.
System health and scheduling
The Honeywell Home T9 Smart Thermostat adds filter change and maintenance reminders and geofenced Auto Home and Away scheduling. The Ecobee Smart Thermostat Essential schedules automatically and suggests setbacks, but it has no system health monitor.
Connectivity and alerts
The Ecobee Smart Thermostat Essential adds Bluetooth 5.0 alongside 2.4 GHz Wi-Fi, and it can alert you to sudden temperature drops or spikes. The Honeywell Home T9 Smart Thermostat is Wi-Fi only with temperature alerts only.
Warranty and display
The Ecobee Smart Thermostat Essential has a 4 inch colour touchscreen, 540 by 540 pixels, and a 3 year warranty. The Honeywell Home T9 Smart Thermostat has a colour touchscreen of an unpublished size and a 2 year warranty.
Price and app
The Ecobee Smart Thermostat Essential is the lower priced of the two. The Honeywell Home T9 Smart Thermostat costs more but bundles its sensor, and its Resideo app is the part owners criticise most, including a permanent hold that quietly overrides the schedule when you adjust the temperature over Wi-Fi.
Which one to buy if
- one room is always a few degrees off
The Honeywell Home T9 Smart Thermostat bundles a room sensor and detects occupancy, so it balances rooms without a separate purchase.
- you want the lowest upfront cost
The Ecobee Smart Thermostat Essential costs less and still covers temperature, humidity, scheduling and every major platform.
- you want a longer warranty
Its 3 year warranty beats the 2 years on the Honeywell.
- you want automatic scheduling that reacts to who is home
Geofenced Auto Home and Away plus occupancy sensing is the T9's core strength.
- you want Bluetooth for local setup
The Ecobee Smart Thermostat Essential adds Bluetooth 5.0; the T9 is Wi-Fi only.
10% OFF
$125.99
$139.99
- + Warranty: 3 years
- + Connectivity: 2.4 GHz WiFi, Bluetooth
- + Alerts: Temperature Alerts, Intrude Alerts
- - Rating: 4.2 vs 4.3
- - Included accessories: None vs Temperature Sensor
Winner
- + Rating: 4.3
- + Included accessories: Temperature Sensor
- + Sensors: Proximity / Motion, Occupancy, Temperature, Humidity
- - Warranty: 2 years vs 3 years
- - Connectivity: 2.4 GHz WiFi vs 2.4 GHz WiFi, Bluetooth
What owners say
Owners of both thermostats praise a straightforward install and a clear colour touchscreen, and both groups came from an older thermostat and found daily use easier. Ecobee Smart Thermostat Essential owners highlight installs of 15 minutes to an hour, an app they call intuitive for schedules, remote control and monthly energy reporting, and easy connections to Alexa and Google Assistant. Their complaints are that SmartSensors cost extra, that some units failed after a few months, that installation is easiest with a C-wire, and that there is no Matter support. Honeywell Home T9 Smart Thermostat owners focus on the bundled sensor, describing a thermostat that detects the occupied room and optimises to it, with the C-wire adapter in the box and a unit that often fits an existing Honeywell wall plate. Their gripes are the fiddly Resideo app, a Wi-Fi temperature change that applies a permanent hold and overrides the schedule, and Smart Room Sensor batteries that some owners replace monthly.
Frequently Asked Questions
Which is better overall: Ecobee Smart Thermostat Essential or Honeywell Home T9 Smart Thermostat?
The Honeywell Home T9 Smart Thermostat when room balancing is the goal, because it includes a Smart Room Sensor with occupancy detection and up to 200 feet of range. The Ecobee Smart Thermostat Essential is the better budget pick, with a lower price, a three-year warranty and the same broad platform support.
What is the biggest difference between the Ecobee Smart Thermostat Essential and the Honeywell Home T9 Smart Thermostat?
The Honeywell Home T9 Smart Thermostat ships a wireless room sensor and detects occupancy, while the Ecobee Smart Thermostat Essential includes no sensor and relies on its screen's proximity sensor. One balances rooms out of the box, the other needs SmartSensors bought separately.
Does the Ecobee Smart Thermostat Essential come with a room sensor?
No. The Ecobee Smart Thermostat Essential works with ecobee SmartSensors and can follow whichever one detects people, but the sensors are sold separately and none ships in the box.
Does the Honeywell Home T9 Smart Thermostat work with Apple HomeKit?
Yes. The Honeywell Home T9 Smart Thermostat supports Apple HomeKit alongside Alexa, Google Assistant, SmartThings and Home Assistant. Neither it nor the Ecobee Smart Thermostat Essential supports Matter.
Do these thermostats need a C-wire?
Both work best with one. The Honeywell Home T9 Smart Thermostat ships a C-wire power adapter in the box for systems without one, while the Ecobee Smart Thermostat Essential owners using systems without a C-wire report needing ecobee's power adapter.
Who should buy which one?
Buy the Honeywell Home T9 Smart Thermostat for a home that heats unevenly and wants occupancy-based prioritisation with the sensor included. Buy the Ecobee Smart Thermostat Essential for a lower-priced, widely compatible thermostat when you do not need room balancing or can add sensors later.
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