29% OFF
$78.00
$109.99
Updated November 2026
Data from the official Honeywell Home site.
2026 verdict
If your problem is a bedroom that never matches the hallway, the Honeywell Home T9 Smart Thermostat is the answer here.
It ships with a Smart Room Sensor that reaches up to 200 feet, reads temperature and humidity and senses occupancy, and it adds humidity and occupancy sensing at the thermostat, support for external sensors you can prioritise room by room, and a graphical colour touchscreen that can show the weather. The Honeywell Home T5 Smart Thermostat keeps the essentials for less, with the same 2-year warranty, ENERGY STAR certification, 7-day scheduling, geofenced Auto Home and Away and Alexa, Google Home and Apple HomeKit support, on a larger 4.95-inch high-contrast touchscreen, and it is the one that sends monthly energy reports with personalised tips. What the T5 cannot do is see past the wall it is mounted on: it has no room sensors, no humidity or occupancy sensing, and it will not switch between heating and cooling on its own. Choose the Honeywell Home T9 Smart Thermostat for a house that heats unevenly; choose the Honeywell Home T5 Smart Thermostat for an evenly heated single-zone home where the lower cost and bigger screen matter more.
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Honeywell Home T5 Smart Thermostat | Honeywell Home T9 Smart Thermostat | Winner |
|---|---|---|---|
| Rating | 4.2 | 4.3 | Honeywell Home T9 Smart Thermostat |
| Included accessories | None | Temperature Sensor | Honeywell Home T9 Smart Thermostat |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant | 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 |
| Warranty | 2 years | 2 years | Tie |
| Power | None | C-Wire Required | Tie |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | 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
Room sensors
This is the gap that defines the pair. The Honeywell Home T9 Smart Thermostat includes a Smart Room Sensor that works up to 200 feet away and can hold a bedroom or office at a set temperature or average several rooms. The Honeywell Home T5 Smart Thermostat has no external sensor support at all, so it reads only the wall it is mounted on.
Humidity and occupancy
The Honeywell Home T9 Smart Thermostat senses humidity at the thermostat and at each Sensor, and detects occupancy through the Sensors. The Honeywell Home T5 Smart Thermostat measures temperature only, with no humidity or occupancy reading.
External sensor control
Beyond the sensor in the box, the Honeywell Home T9 Smart Thermostat supports external temperature sensors you can select or let follow occupancy. The Honeywell Home T5 Smart Thermostat does not, which is the limit that decides the choice in an uneven house.
Display
The Honeywell Home T5 Smart Thermostat has the larger panel at 4.95 inches, black with white numerals and easy to read across a room. The Honeywell Home T9 Smart Thermostat uses a graphical colour touchscreen that can also show the weather, a detail the T5 screen does not offer.
Energy reports
The Honeywell Home T5 Smart Thermostat sends monthly energy reports with personalised tips, and the Honeywell Home T9 Smart Thermostat does not match that guidance. Both are ENERGY STAR certified, so the difference is the coaching, not the efficiency label.
Which one to buy if
- rooms in your house heat unevenly
The Honeywell Home T9 Smart Thermostat's included Smart Room Sensor lets the system follow the occupied room instead of the hallway.
- you want humidity readings from your thermostat
The Honeywell Home T9 Smart Thermostat senses humidity at the unit and at each Sensor, and the Honeywell Home T5 Smart Thermostat does not.
- your home heats evenly and the budget is the point
The Honeywell Home T5 Smart Thermostat covers scheduling, geofencing and the three major assistants without paying for sensors it would not use.
- you want the weather on the thermostat screen
The Honeywell Home T9 Smart Thermostat's colour display shows weather, and the Honeywell Home T5 Smart Thermostat only shows temperature and time.
- you want monthly energy tips to trim your bill
The Honeywell Home T5 Smart Thermostat sends monthly energy reports with personalised suggestions, a feature its sibling does not list.
29% OFF
$78.00
$109.99
- - Rating: 4.2 vs 4.3
- - Included accessories: None vs Temperature Sensor
Winner
- + Rating: 4.3
- + Included accessories: Temperature Sensor
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, External Temperature Sensors
What owners say
Owners of both Honeywell models praise the same easy installation, with the wall plate often reused when replacing an older thermostat, and both groups value the smooth control from the phone. Honeywell Home T9 Smart Thermostat owners single out the Smart Room Sensor doing exactly what it promises, detecting which room is occupied and heating that one, with several choosing it after leaving a Nest, and they call it a good thermostat before it is a smart one. Honeywell Home T5 Smart Thermostat owners talk more about value and the clean black touchscreen, and about scheduling that turns out easier than the reviews suggest. The complaints diverge too: T9 owners blame the fiddly Resideo app, a Wi-Fi change that applies a permanent hold, and short sensor battery life, while T5 owners warn about the single wall sensor, the missing humidity and occupancy readings, and a few units that were slow to respond or failed outright.
Upgrading from the Honeywell Home T5 Smart Thermostat?
Moving from the Honeywell Home T5 Smart Thermostat to the Honeywell Home T9 Smart Thermostat buys awareness: a Smart Room Sensor in the box that reaches up to 200 feet and tracks temperature, humidity and occupancy, plus humidity sensing at the thermostat. The scheduling, geofencing, voice assistants, ENERGY STAR rating and 2-year warranty carry over unchanged, and the installation is just as quick with the C wire adapter supplied. If your home heats evenly and the T5 already keeps it comfortable, there is little to gain. If one room is always colder than the rest, the T9 is the step that fixes it.
Frequently Asked Questions
Which is better overall: Honeywell Home T5 Smart Thermostat or Honeywell Home T9 Smart Thermostat?
The Honeywell Home T9 Smart Thermostat wins on what it can sense, with an included Smart Room Sensor, humidity and occupancy detection and support for prioritising rooms. The Honeywell Home T5 Smart Thermostat is the better budget pick for an evenly heated home, with a larger touchscreen, monthly energy reports and the same core features.
What is the biggest difference between the Honeywell Home T5 Smart Thermostat and the Honeywell Home T9 Smart Thermostat?
Room awareness. The Honeywell Home T9 Smart Thermostat ships with a Smart Room Sensor that reaches up to 200 feet and reads temperature, humidity and occupancy, and it supports more sensors. The Honeywell Home T5 Smart Thermostat measures only its own wall and cannot use external sensors.
Does the Honeywell Home T5 Smart Thermostat support room sensors?
No. The Honeywell Home T5 Smart Thermostat has no external sensor support, so it reads only the temperature where it is mounted. For room sensors, the Honeywell Home T9 Smart Thermostat is the one to buy.
Do the Honeywell Home T5 Smart Thermostat and Honeywell Home T9 Smart Thermostat work with the same platforms?
Largely yes. Both work with Alexa, Google Home, Apple HomeKit and SmartThings through Honeywell's integrations. The Honeywell Home T9 Smart Thermostat's extra is external temperature sensor support; neither supports Matter.
Which of the two has the larger display?
The Honeywell Home T5 Smart Thermostat has the larger panel at 4.95 inches, high-contrast and readable across a room. The Honeywell Home T9 Smart Thermostat has a graphical colour touchscreen that adds weather instead of size.
Who should buy the Honeywell Home T5 Smart Thermostat, and who should buy the Honeywell Home T9 Smart Thermostat?
The Honeywell Home T5 Smart Thermostat suits an evenly heated single-zone home on a budget that wants scheduling, geofencing and monthly energy reports. The Honeywell Home T9 Smart Thermostat suits a house where rooms differ and you want sensors to follow occupancy or hold a specific room.
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