X8S Smart Thermostat

Honeywell Home X8S Smart Thermostat

The Honeywell Home X8S Smart Thermostat is a smart home temperature controller designed to manage compatible heating and cooling systems through a touchscreen interface and the First Alert by Resideo app. It provides room temperature control, indoor humidity information, scheduling features, wireless room sensor integration, and smart home connectivity.

The X8S supports XRSENSOR wireless indoor room sensors, allowing different rooms in the home to be prioritized for temperature control. Rooms can be selected manually or automatically according to detected activity.

The thermostat also supports compatible video doorbell integration. With a First Alert VX1 or compatible Ring video doorbell, live camera video can be viewed on the thermostat’s display after setup through the First Alert app.

The X8S provides indoor air quality controls for systems configured with compatible humidification, dehumidification, or ventilation equipment. Users can access these controls directly from the thermostat or through the mobile app. Additional features include a customizable idle screen with seven display styles, Matter compatibility for supported smart home automations, Auto Away scheduling, smart alerts, reminders, and monthly energy reports.

The First Alert by Resideo app allows users to control their thermostat remotely and access compatible connected safety devices, including separately purchased water leak, smoke, and carbon monoxide detectors.

Product Overview and Technical Specifications

The X8S Smart Thermostat belongs to the Honeywell Home smart thermostat product family and is manufactured by Resideo Technologies, Inc.

X8S Smart Thermostat Models

The Honeywell Home X8S is available in white and black versions, with different model numbers for the United States and Canada.

Some United States packages include a wireless room sensor.

Model Comparison

White and Black Thermostat Models

The X8S is offered with different exterior colors.

The model illustrated in the manufacturer’s guide is white, although the same operating instructions apply to the listed X8S models.

Models With a Room Sensor

The following United States packages are identified as thermostat-and-room-sensor combinations:

• X8VMC9W — White thermostat with room sensor.
• X8VWF10B — Black thermostat with room sensor.

Thermostat Display, Components, and Controls

The X8S uses a touchscreen interface for temperature adjustments, system operation, and configuration.

The home screen presents the most relevant operating information, including the current temperature, selected temperature, weather, time, humidity, indoor air quality, and thermostat operating modes.

Home Screen Overview

Current Temperature

The large temperature value in the center of the display represents the current indoor temperature.

This reading allows occupants to compare the measured temperature with the selected target.

Set Temperature

The Set Temperature area displays the desired heating or cooling temperature.

The touchscreen provides Up and Down arrows beside the selected temperature.

System Mode

The System Mode area provides access to the thermostat’s heating and cooling operating mode.

Fan Mode

The Fan Mode area provides access to fan operation settings.

Menu

The Menu control opens additional thermostat features, including room priority, indoor air quality functions, display preferences, and Matter setup.

Indoor Humidity and Air Quality

The home screen includes indoor humidity and indoor air quality information.

Additional controls are available when the thermostat is configured to operate compatible indoor air quality equipment.

Connecting the X8S to the First Alert by Resideo App

The First Alert by Resideo app provides remote access to the X8S Smart Thermostat and its supported smart home features.

Step 1: Access the First Alert App

The manufacturer’s guide provides a QR code for downloading the application.

The app can also be accessed through:

Step 2: Open the First Alert App

After installing the application, open it on the mobile device.

Step 3: Connect the Thermostat

Use the First Alert app to connect the X8S Smart Thermostat to the mobile application.

Follow the configuration instructions presented in the app.

Step 4: Access Thermostat Controls

After the thermostat has been connected, compatible heating and cooling functions can be managed remotely.

First Alert App Features

The First Alert by Resideo app provides remote thermostat operation and access to several connected home functions.

Auto Away and Smart Scheduling

The app supports Auto Away and Smart Scheduling features for managing temperature settings according to household needs.

Alerts and Reminders

Notifications and reminders can be accessed through the First Alert app.

Monthly Energy Reports

The application includes monthly energy reports for reviewing thermostat-related energy information.

Remote Control

The X8S can be controlled through the First Alert app from away from the thermostat.

Connected Safety Devices

The First Alert app also supports monitoring compatible water leak detectors and smoke and carbon monoxide detectors.

These devices are sold separately.

XRSENSOR Wireless Room Sensors

The X8S supports XRSENSOR wireless indoor room sensors.

These sensors allow temperature control to be based on different areas of the home rather than using only one location.

The room priority function can be configured manually or can respond to detected activity.

Room Priority Options

The thermostat supports two room selection approaches.

Selected Rooms

Selected Rooms allows occupants to choose which rooms contribute to the temperature used for heating and cooling control.

The thermostat uses the selected rooms to calculate an average temperature.

Rooms that are not selected are excluded from this average.

Active Rooms

Active Rooms allows the XRSENSOR devices to determine which rooms should be prioritized according to detected activity.

Rooms where activity is detected are selected automatically.

This allows temperature control to respond to the areas currently being occupied.

Comparing Selected and Active Room Priority

How to Change Room Priority

Room priority settings are available directly through the thermostat.

Step 1: Open the Menu

Touch Menu on the X8S home screen.

Step 2: Select Priority

Choose Priority from the thermostat menu.

Step 3: Choose the Priority Method

Select one of the following:

• Selected Rooms.
• Active Rooms.

Step 4: Configure Selected Rooms

When Selected Rooms is chosen, select the rooms that should contribute to the temperature average.

Step 5: Use Active Rooms

When Active Rooms is selected, the wireless sensors automatically prioritize areas where activity is detected.

Step 6: Save the Settings

Touch Save to apply the selected room priority configuration.

Understanding Room Priority Examples

The manufacturer’s display illustrations demonstrate how room selection works.

Selected Rooms Example

A home may have wireless sensors in areas such as:

• Living Room.
• Kitchen.
• Family Room.
• Recreation Room.
• Basement.
• Guest Room.

Selected Rooms allows the required areas to be chosen manually.

The thermostat uses the selected rooms for its temperature average.

Active Rooms Example

When Active Rooms is selected, rooms with detected activity are prioritized automatically.

This allows the thermostat’s temperature control to follow activity within the monitored areas.

Indoor Air Quality Controls

The X8S can provide additional indoor air quality controls when the thermostat has been configured to control compatible equipment.

Available functions depend on the installed system.

Supported Indoor Air Quality Functions

How to Access Indoor Air Quality Settings

1. Open Menu on the X8S thermostat.
2. Scroll through the available options.
3. Select Humidification, Dehumidification, or Ventilation.
4. Adjust the available settings for the configured equipment.

These functions can also be adjusted through the First Alert by Resideo app.

Ventilation Control

The ventilation screen provides operating controls for the connected ventilation system.

The illustrated interface includes Auto and Off choices.

The available ventilation functions depend on the configured equipment.

Connecting a Video Doorbell to the X8S

The X8S supports compatible video doorbell integration.

The manufacturer’s guide identifies First Alert VX1 and Ring video doorbell cameras as supported device families.

Compatible Video Doorbell Types

Viewing Live Video

After a compatible video doorbell has been paired, live video can be viewed on the thermostat display.

How to Set Up a Video Doorbell

1. Open the First Alert by Resideo app.
2. Use the app to pair the compatible First Alert VX1 or Ring video doorbell.
3. Follow the device setup instructions provided by the app.
4. Access the supported live-video function through the X8S thermostat.

Video display functionality depends on the compatibility of the connected doorbell.

Customizing the Thermostat Idle Screen

The X8S allows the idle display to be customized.

The manufacturer provides seven different idle screen styles and colors.

These display options allow the thermostat to present preferred information in different visual layouts.

How to Change the Idle Screen

1. Open Menu on the thermostat.
2. Select Preferences.
3. Select Display.
4. Choose Idle Screen.
5. Browse the available styles.

Previewing a Display Style

Select Preview to view the chosen idle screen design.

Saving a Display Style

After selecting the preferred appearance, touch Save.

Idle Screen Customization Options

The available selection consists of seven styles and colors.

Matter Smart Home Integration

The X8S supports Matter for compatible smart home automation.

Matter-enabled automation can be used to control the thermostat’s temperature setpoints and change its system operating mode.

Matter Functions

How to Set Up Matter on the X8S

Matter setup is accessed through the thermostat menu.

Step 1: Open Menu

Touch Menu on the X8S home screen.

Step 2: Select Matter

Scroll down and select Matter.

Step 3: Follow the On-Screen Instructions

The thermostat displays the required Matter setup instructions.

Step 4: Open the Matter Controller

Use the compatible Matter controller to begin the device pairing process.

Step 5: Complete Pairing

The thermostat provides two pairing methods:

• Scan the Matter QR code displayed on the thermostat.
• Enter the displayed pairing code.

Follow the controller’s instructions to complete setup.

Energy Rebates and Utility Incentives

The manufacturer’s guide provides information about utility incentive and rebate programs.

Energy providers may offer incentives for compatible smart thermostat installations.

To find participating energy providers and available programs, visit:

Rebate availability depends on the participating provider and its program requirements.

Regulatory Information

The X8S Smart Thermostat complies with applicable United States and Canadian radio equipment regulations.

FCC Compliance

The device complies with Part 15 of the FCC Rules.

Operation is subject to two conditions:

1. The thermostat must not cause harmful interference.
2. It must accept received interference, including interference that may cause undesired operation.

FCC Modification Warning

Changes or modifications not expressly approved by the responsible party may void authorization to operate the equipment.

Canadian IC Compliance

The device contains licence-exempt radio transmitters and receivers that comply with applicable Innovation, Science and Economic Development Canada requirements.

Its operation is subject to the conditions that it must not cause interference and must accept received interference.

RF Exposure and Installation Precautions

The manufacturer’s guide specifies radio-frequency exposure requirements.

Minimum Separation Distance

The transmitting antennas must be installed to provide a separation distance of at least 20 cm from all persons.

Antenna Placement

The transmitting antennas must not be positioned or operated together with another antenna or transmitter.

Indoor Radio Band Restrictions

Operation in the following bands is restricted to indoor use:

These restrictions help reduce potential harmful interference with mobile satellite systems operating on the same channels.

Electronic Waste Disposal

The X8S Smart Thermostat must not be discarded with ordinary household waste at the end of its service life.

The manufacturer directs users to authorized collection centers or recyclers.

Proper electronic waste disposal helps reduce potential environmental and human health impacts.

Warranty Information

The Honeywell Home X8S Smart Thermostat includes a 2-year limited warranty.

Warranty Details

Obtaining a Printed Warranty

A printed version of the warranty can be requested by calling Resideo Customer Care toll-free.

Phone: 1-800-633-3991

The manufacturer provides the printed warranty copy by mail free of charge.

Customer Support and Manufacturer Information

The Honeywell Home X8S Smart Thermostat is manufactured by Resideo Technologies, Inc. under license to use the Honeywell Home trademark.

Frequently Asked Questions

1. How is the Honeywell Home X8S Smart Thermostat connected to the First Alert app?

The X8S connects through the First Alert by Resideo app.

The application can be accessed at https://info.firstalert.com/FA-app-download.

After installing the app, follow its instructions to connect and configure the thermostat.

3. How does room priority work on the Honeywell X8S?

The X8S uses compatible XRSENSOR wireless room sensors to prioritize areas of the home.

Selected Rooms allows rooms to be chosen manually for temperature averaging.

Active Rooms automatically prioritizes rooms where activity is detected.

Both options are available under Menu > Priority.

4. Can the Honeywell X8S display video from a Ring doorbell?

Yes. The manufacturer’s guide identifies compatible Ring and First Alert VX1 video doorbells as supported devices.

Compatible cameras can be paired through the First Alert by Resideo app, allowing live video to be viewed on the thermostat.

5. How is the idle screen changed on the X8S thermostat?

Open Menu > Preferences > Display > Idle Screen.

Browse the seven available display styles and colors.

Select Preview to view a design, then touch Save to apply the selected appearance.

6. Does the Honeywell X8S support Matter?

Yes. Matter integration allows compatible automations to control temperature setpoints and change the system mode.

Open Menu, select Matter, and follow the on-screen setup instructions.

A compatible Matter controller can pair the thermostat using the displayed QR code or pairing code.

7. Can the X8S control indoor humidity and ventilation?

Yes, when the thermostat has been configured to control compatible indoor air quality equipment.

Humidification, Dehumidification, and Ventilation settings can be accessed through the thermostat Menu or the First Alert by Resideo app.

8. What warranty comes with the Honeywell Home X8S Smart Thermostat?

The X8S includes a two-year limited warranty.

Warranty information is available at https://resideo.info/US-Warranty-THERMOSTAT.

A free printed warranty copy can be requested from Resideo Customer Care at 1-800-633-3991.