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.