Honeywell Home T9 Review: The Smart Thermostat with Best Sensors
Honeywell’s T9 competes with Ecobee’s sensor strategy—room sensors included, multi-room temperature balancing. How
does it compare?
For complete comparisons, see our guide to Best Smart Thermostats That
Save Money.
Quick Specs
| Specification | Honeywell T9 |
|---|---|
| Price | $180-200 |
| Room Sensors | 1 included |
| C-Wire Required | Yes |
| Smart Home | Alexa, Google (no HomeKit) |
| Geofencing | Yes (multi-user) |
| Display | Color touchscreen |
What Makes T9 Different
Smart Room Sensors
Like Ecobee, T9 includes a room sensor that detects both temperature and motion. Use it to balance temperatures
across rooms or prioritize occupied spaces.
Multi-User Geofencing
The T9’s geofencing works with multiple phones. It only switches to “away” when everyone leaves—not when just one
person does.
Honeywell Heritage
Honeywell has been making thermostats for 100+ years. The T9 works with virtually any HVAC system.
Pros
- Room sensor included
- Multi-user geofencing works well
- Excellent HVAC compatibility
- Honeywell support and reliability
- Cheaper than Ecobee ($180 vs $250)
Cons
- No Apple HomeKit
- App is less intuitive than Nest/Ecobee
- C-Wire required (no adapter included)
- Design is functional, not beautiful
T9 vs Ecobee Premium
| Feature | Honeywell T9 | Ecobee Premium |
|---|---|---|
| Price | $180 | $250 |
| Room Sensor Included | ✅ 1 | ✅ 1 |
| HomeKit | ❌ | ✅ |
| Built-in Alexa | ❌ | ✅ |
| C-Wire Adapter | ❌ Not included | ✅ Included |
| App Quality | Good | Excellent |
Room Sensor Features
The T9’s Smart Room Sensor offers:
- Temperature sensing: Reports room temperature
- Motion detection: Knows when room is occupied
- Focus mode: Prioritize specific rooms by time
- Follow me: Auto-adjust based on occupancy
Additional sensors: $40 for 2-pack.
App and Control
The Honeywell Home app controls the T9. It’s functional but not as polished as Ecobee or Nest:
- Set schedules
- Manage geofencing for all users
- Configure sensor priority by time of day
- View energy reports
Voice control works via Alexa and Google Home—just no HomeKit.
Installation
Installation is straightforward if you have a C-Wire:
- Turn off HVAC
- Remove old thermostat, label wires
- Mount T9 baseplate
- Connect wires
- Attach thermostat, restore power
- Complete setup in Honeywell Home app
Note: C-Wire is required and no adapter is included. If you don’t have a C-Wire, consider Ecobee
(includes adapter) or Nest E (doesn’t need C-Wire).
Who Should Buy T9?
- Want room sensors at lower price than Ecobee
- Need multi-user geofencing
- Don’t need Apple HomeKit
- Value Honeywell reliability
- Have C-Wire available
Who Should Skip T9?
- Apple/HomeKit users → Get Ecobee
- Want best app experience → Get Nest or Ecobee
- No C-Wire → Get Nest E or Sensi
- Want built-in voice assistant → Get Ecobee Premium
Verdict
The Honeywell T9 is the value alternative to Ecobee. You get room sensors and multi-user geofencing
at $70 less. The app isn’t as refined, and there’s no HomeKit—but it’s a solid thermostat from a reliable brand.
For complete comparisons, see: Best Smart Thermostats That Save
Money.