Alarm.com HD Smart Thermostat (ADC-T40K-HD)

Take control of your comfort with the Alarm.com HD Smart Thermostat — a sleek, high-definition touchscreen thermostat built for seamless integration with the Alarm.com smart home platform. Whether you’re adjusting settings from your phone, creating energy-saving schedules, or automating temperature changes based on your location with geo-fencing, the ADC-T40K-HD makes it easy.

Smarter Comfort with Sensor Integration
Pair the ADC-T40K-HD with Alarm.com temperature sensors like the ADC-S40-T for enhanced climate control. This setup lets you prioritize specific rooms — such as a nursery or home office — ensuring they stay at your desired temperature. While the thermostat doesn’t control airflow to individual rooms, it intelligently adjusts your HVAC system to maintain consistent comfort throughout your home or business. Plus, it can help reduce energy usage by preventing unnecessary heating or cooling.

Effortless Setup & Diagnostics
Installation is simple thanks to the thermostat’s built-in setup wizard and intuitive interface. Once powered, it can even help troubleshoot issues by displaying diagnostic messages for wiring errors or HVAC system problems right on the screen — saving you time and guesswork.

System Requirements
To use the ADC-T40K-HD, you’ll need an Alarm.com service plan that includes Automation (available in both Residential and Commercial plans). Your HVAC system must also be 24V-compatible. While the thermostat does not support 120V or 240V systems directly, a qualified HVAC technician can adapt most systems to meet this requirement.

Key Features

• High-definition touchscreen display

• Full integration with Alarm.com for remote access, scenes, and schedules

• Geo-fencing support for location-based automation

• Compatible with Alarm.com temperature sensors

• Built-in setup and diagnostics tools

• Works with most 24V HVAC systems

Enjoy smarter, more personalized comfort with the Alarm.com HD Smart Thermostat — designed to make your home or business more efficient and comfortable, every day.