Honeywell Home X8S Smart Thermostat
By Ethan Halfhide · Updated
The Honeywell Home X8S Smart Thermostat costs $219.99 on Honeywell Home's US store as of October 2026, or $249.99 with a wireless room sensor, in black or white. The older Honeywell Home T9 Smart Thermostat is now marked discontinued on the same store, while the X8S is listed in stock. Resideo says the X8S is Matter certified and also compatible with Amazon Alexa, Google Assistant and Apple Home, with remote control in the Resideo Connect app. A 5 inch touchscreen shows indoor humidity, outdoor temperature and the time, with selectable idle screen themes and colors. An onboard radar sensor handles occupancy and presence detection once the included Auto-Away feature is turned on. The thermostat can also act as a doorbell camera viewer and intercom for First Alert VX1 and Ring streaming doorbells (sold separately), and it can control humidity and ventilation, though Resideo notes additional HVAC equipment or accessories may be required. It is ENERGY STAR certified, eligible for utility rewards, and supports up to 4 heat and 2 cool stages on heat pump systems or up to 3 heat and 4 cool stages on conventional systems. It needs a C-wire, connects to 2.4 or 5 GHz Wi-Fi, and carries a two-year limited warranty.
Matter certified 5 inch touchscreen thermostat with radar presence sensing and a doorbell viewer
Honeywell Home X8S Smart ThermostatProduct images: Honeywell Home X8S Smart Thermostat
Specs and price last verified October 21, 2026
Specifications
- Price
- $219.99
- Device type
- Thermostat
- Ecosystems
- Alexa, Google Home, HomeKit, Matter
- Rooms
- Living Room, Whole Home
- Connectivity
- Wi-Fi, Matter
- Hub required
- No
- Rental friendly
- No
- Matter certified
- Yes
- Installation
- Hardwired (C-wire required)
- Energy Star
- Yes
- Local control
- Not published
- Voice control
- Yes
About
The Honeywell Home X8S Smart Thermostat from Resideo has a 5 inch touchscreen with customizable idle screens, an onboard radar sensor for occupancy and presence detection, indoor air quality monitoring with humidity and ventilation control (extra HVAC equipment may be required), and a video doorbell viewer and intercom for compatible First Alert and Ring streaming doorbells. It is Matter certified, works with Amazon Alexa, Google Assistant and Apple Home, and is controlled in the Resideo Connect app. It is ENERGY STAR certified and needs a C-wire.
Setup and compatibility notes
- Check your wiring: Resideo lists the power source as hardwired with a C-wire required. Its accessory list includes a C-Wire Power Adapter at $24.99 as of October 2026.
- System support: up to 4 heat and 2 cool stages for heat pumps, or up to 3 heat and 4 cool stages for conventional systems. Modes are heat, cool, auto, off and emergency heat.
- In the box: the X8S thermostat, a UWP wall plate, screws and anchors, and literature; the room sensor bundles add one wireless indoor sensor.
- Network: a 2.4 or 5.0 GHz Wi-Fi network on an 802.11ax/ac/a/b/g/n router.
- App and assistants: set up and control it in the Resideo Connect app on iOS or Android. Resideo lists Matter certification and compatibility with Amazon Alexa, Google Home and Apple Home.
- Presence sensing: occupancy and presence features require turning on the included Auto-Away feature.
- Room sensors: optional on the base model; the Smart Thermostat Compatible Wireless Room Sensor is listed at $44.99.
- Size: 5.24 x 3.54 x 0.96 inches and 0.91 lb. The display language can be English, French or Spanish.
- Guides: Resideo posts a Getting Started Guide, user guides and an installation and user manual on the product page.
- Alerts and reports: the thermostat gives filter change and heat pump failure reminders, and Resideo offers monthly energy reports that break down heating and cooling use.
- Utility programs: ENERGY STAR certified and listed for utility rewards, so check your utility for rebates or energy program enrollment.
Pros
- +Matter certified; works with Alexa, Google Assistant and Apple Home
- +Onboard radar sensor for occupancy and presence detection
- +See and talk to visitors on compatible First Alert and Ring doorbells
- +Humidity and ventilation control for indoor air quality
- +ENERGY STAR certified with utility rewards eligibility
- +Supports up to 4 heat and 2 cool stages on heat pump systems
Cons
- −C-wire required
- −Room sensor costs extra ($44.99) unless you buy the $249.99 bundle
- −IAQ control may need additional HVAC equipment
- −Doorbell viewer works only with First Alert and Ring streaming doorbells
- −Two-year limited warranty
How it compares
| Device | Price | Ecosystems | Matter | Hub required | Local control |
|---|---|---|---|---|---|
| Honeywell Home X8S Smart Thermostat | $219.99 | Alexa, Google Home, HomeKit, Matter | Yes | No | Not published |
| Nest Learning Thermostat (4th Gen) | $279.99 | Google Home, Matter | Yes | No | No |
| Ecobee Smart Thermostat Premium | $259.99 | Alexa, Google Home, HomeKit, SmartThings | Not published | No | No |
| Aqara Thermostat Hub W200 | $129.99 | Alexa, Google Home, HomeKit, SmartThings | Yes | No | Yes |
FAQ
- How much does the Honeywell Home X8S cost?
- $219.99 on Honeywell Home's US store as of October 2026, or $249.99 for the version with a wireless room sensor.
- Does the X8S work with Apple Home and Matter?
- Yes. Resideo says the X8S is Matter certified and also compatible with Amazon Alexa, Google Assistant and Apple Home.
- Does it need a C-wire?
- Yes. Resideo lists the power source as hardwired with a C-wire required, and sells a C-Wire Power Adapter as an accessory.
- Which doorbells can I see on the thermostat?
- Resideo says the doorbell viewer and intercom work with First Alert VX1 and Ring streaming doorbells, which are not included.
- Is the Honeywell Home T9 still sold?
- No. Honeywell Home's store marks the T9 Smart Thermostat variants as discontinued and says the product is no longer available for sale.
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About the author
Ethan Halfhide: Ethan Halfhide is a smart home enthusiast and AI technologist who follows the connected home market closely, from smart locks and security cameras to robot vacuums, lighting, sensors and hubs. He curates HomeGearLab's device directory, comparing products on published specs, compatibility, setup requirements and price so readers can pick gear that fits their home and works together.