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

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

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


The Alarm.com ADC-T40K-HD is an aesthetically pleasing black-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 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 black-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 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)
Installation Guide for Alarm.com Smart Thermostat (ADC-T40K-HD)

Frequently Asked Questions

Can the Smart Thermostat HD (ADC-T40K-HD) be powered by batteries?
Should a physical jumper be used with the Alarm.com Smart Thermostat HD (ADC-T40K-HD)?
What are the components of the Smart Thermostat HD (ADC-T40K-HD)?
What happens to the Alarm.com Smart Thermostat HD (ADC-T40K-HD) after a power loss?
Why does the Smart Thermostat HD (ADC-T40K-HD) 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: Black
  • 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:
5 out of 5 stars
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  We love this one.,
Posted By:
1 people found this review helpful

Love the functionality and appearance of this thermostat on my wall. Overall, very nice thermostat so far so good, it is working flawlessly.

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  Next Generation Alarm.com Smart Thermostat,
Posted By:

Pretty simplistic thermostat. I have two setup in my home and I can tell you the setup wasn't too bad. It took me about 30 minutes to install and maybe 5-10 minutes to pair. I choose the black display because I like being able to see the digital display in the dark frame, but they also have a white display option too. You'll have no issues installing this if you're a hands-on person and can follow instructions. Otherwise, hire someone to install this and take no chances.

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  Awesome Alarm.com Thermostat!,
Posted By:

Awesome thermostat. Love the look, and font view of it aesthetically speaking! By either using the touchscreen when I am in my living room or by using my Alarm.com app I am able to control the temperature remotely from anywhere.

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  Excellent Thermostat,
Posted By:

Initially, the thermostat was a little hard to install, but once I got it installed, I enjoyed it. Having the ability to change the climate from the comfort of the couch or bed is great.

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  Very user friendly!,
Posted By:

Super easy to install, with clear, well-written instructions and diagrams. Connects easily to WiFi. Numerous features, including schedules, occupancy awareness, and links to utility energy-saving programs. Easy to install and very user-friendly!

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  Very easy installation and setup, great performance.,
Posted By:

Using the Alarm.com app, I could program as many timed setpoints as I wanted. You can repeat the same program for several days of the week (mid-week), and use another program for other parts of the week (weekend). Or you can have a different program for any day of your choice or the same program for all the days of the week. Complete freedom to decide how/when your home will be heated and cooled. I like this freedom because where I live the electricity is super expensive at certain hours of the day so I program the thermostat to not heat or cool during these hours. And I also like to drop the temperature at night when we sleep and raise the temp before we get up in the morning. Everything is possible and easy to do.

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