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

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

Average Customer Rating:
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List Price: $365.63
Your Price: $243.75
Availability: In Stock
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Alarm.com ADC-T40K-HD Product Description:


The Alarm.com ADC-T40K-HD is an aesthetically pleasing 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.

Product Features:

  • Touchscreen 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 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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  Must have for good control!,
Posted By:

Pretty simplistic thermostat. I have two in my home. Set up wasn?t too bad. It took me about 30 minutes to install and maybe 5-10 minutes to pair. I like being able to see the display in the dark.
You'll have no issues 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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  We love this one.,
Posted By:

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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