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ADC-T40K-HD-W - Alarm.com Smart Thermostat HD with Color Touchscreen (White Display)

ADC-T40K-HD-W - Alarm.com Smart Thermostat HD with Color Touchscreen (White Display)
ADC-T40K-HD-W - Alarm.com Smart Thermostat HD with Color Touchscreen (White Display)
Item# ADC-T40K-HD-W

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List Price: $394.88
Your Price: $263.25
Availability: In Stock
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Alarm.com ADC-T40K-HD-W Product Description:


The Alarm.com ADC-T40K-HD-W is an aesthetically pleasing white-color display smart thermostat that offers a sleek, color touchscreen display for an engaging customer experience that delivers the next-level of comfort and control. With mechanical wire detection, an easy setup wizard, and local configuration, the Smart Thermostat HD makes installation a breeze. The Smart Thermostat HD can also monitor the health of the heating and cooling system, deliver monthly performance reports, and even alert you to potential HVAC issues right on its display.

When installing, please keep in mind that the Smart Thermostat HD requires 24 VAC power. There is no option for a battery-powered mode. Power is supplied via a common wire, typically identified as C. Mount on an inside wall, approximately 5 ft. (1.5 m) above the floor in a frequently used room. Avoid areas that are exposed to large temperature variances, such as: direct sunlight, near an AC unit, above or below auxiliary heat and air vents, and drafts from windows or exterior doors.

The Alarm.com ADC-S40-T is a temperature sensor specifically designed to work with the Alarm.com ADC-T40K-HD-W Smart Thermostat to provide advanced functionality and precision comfort. With the ADC-S40-T temperature sensor, the end-user can monitor the temperature of any indoor location and receive temperature/humidity alerts through the web or mobile device.

Product Features:

  • Touchscreen white-color display
  • Easy to use setup wizard
  • Z-Wave SmartStart and S2 compatible
  • Full integration with the Alarm.com platform - Scenes, energy-saving schedules, and geo-fences
  • Optional local scheduling - install in a vacant home prior to account creation
  • Humidity control
  • Vent control

Installation Note: For installation of the Alarm.com ADC-T40K-HD-W smart thermostat HD, you should have knowledge of your high-voltage HVAC system. If not, we recommend you hire an HVAC technician to install on your behalf due to the risk of injury to a non-professional. GeoArm will not troubleshoot wiring and power issues without an HVAC Technician present.

Alarm.com ADC-T40K-HD Product Documents:


General Information

Data Sheet for Alarm.com Smart Thermostat (ADC-T40K-HD-W)
Installation Guide for Alarm.com Smart Thermostat (ADC-T40K-HD-W)

Frequently Asked Questions

Can the Smart Thermostat HD (ADC-T40K-HD-W) be powered by batteries?
Should a physical jumper be used with the Alarm.com Smart Thermostat HD (ADC-T40K-HD-W)?
What are the components of the Smart Thermostat HD (ADC-T40K-HD-W)?
What happens to the Alarm.com Smart Thermostat HD (ADC-T40K-HD-W) after a power loss?
Why does the Smart Thermostat HD (ADC-T40K-HD-W) setup wizard recommend a different HVAC system than expected?

More Information

Alarm.com Smart Thermostat - Frequently Asked Questions
Alarm.com Smart Thermostats - Troubleshooting Guide
Alarm.com Smart Thermostats - Wiring and Configuration Guide
Enroll and configure the Alarm.com Smart Thermostats

Alarm.com ADC-T40K-HD Product Specifications:


  • Dimensions (H x W x D): 4.7 x 4.7 x 1.07" (12 x 12 x 2.72 cm)
  • Color: White
  • Operating Temperature: 41°F to 95°F (5°C to 35°C)
  • Communications: Z-Wave SmartStart Z-Wave S2 Authenticated/Unauthenticated
  • Near Universal 24 V Compatibility: Yes
  • Humidifier: Yes
  • Dehumidifier: Yes
  • Forced Air: Yes
  • Heat Pump: Yes - Compatible with both O and B systems
  • Heat: Up to 3 stages
  • Cool: Up to 2 stages
  • Dual Fuel: Yes
  • Ventilation Control: HRV, ERV, External Air Baffle

Alarm.com ADC-T40K-HD Product Includes:


  • Trim plate
  • ADC-T40 Thermostat
  • ADC-T40-HD Touchscreen Display
  • Drywall anchors x2
  • Wall screws x2
  • Installation guide

Alarm.com ADC-T40K-HD Recommened Tools:


  • Phillips screwdriver
  • Pencil to mark mounting location
  • Power drill - 3/16" (#13) drill bit
  • Needle nose pliers
  • Camera

Product Reviews

Other customers rated this item:
4.5 out of 5 stars
WRITE A REVIEW(Reviews are subject to approval)
  Upgraded Comfort and a Clean Looking Product on my Wall!,
Posted By:
7 people found this review helpful

The HD color touchscreen is not only aesthetically pleasing but also provides clear and detailed information. The thermostats smart features, such as learning my schedule and adjusting the temperature accordingly, have significantly improved my home's energy efficiency. Besides the price which is a few more dollars than what I wanted to spend, this was a great upgrade that can be controlled using the Alarm.com App. Thanks GeoArm Tech Team for walking through the install and for making my home more comfortable!

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  Highly Recommend,
Posted By:
8 people found this review helpful

The Alarm.com thermostat is a revolutionary product that has completely transformed my home environment. This smart thermostat is not just a device, it's a lifestyle.


The HD color touchscreen is a standout feature. It's not only aesthetically pleasing but also incredibly user-friendly. The interface is intuitive and easy to navigate, making it simple for anyone to adjust the temperature or program settings.


The smart capabilities of this thermostat are truly impressive. It learns your habits and adjusts accordingly, ensuring optimal comfort while also saving energy. The ability to control the thermostat remotely from my smartphone is a feature I never knew I needed until I had it.


The installation process was straightforward and the customer service provided by GeoArm was top-notch. They were there to assist every step of the way.


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