Includes: one THX9421R-5021WW/U Programmable touchscreen thermostat, one THM5421R-1021/U equipment interface module, and two duct sensors

3 heat and 2 cool stages for conventional systems - 4 heat and 2 cool stages for heat pumps - Automatic or manual changeover

Control heating, cooling and IAQ equipment with only 2 wires at the thermostat - Heating, cooling and IAQ equipment wires to the Equipment Interface Module

Smart Schedule programs in seconds for any lifestyle - Interview based programming and installer setup - RedLINK wireless communication

Selectable for residential and light commercial applications - Meets commercial code and is title 24 compliant

Light commercial or commercial language (occupied and unoccupied), schedule holidays and custom events, remote setback, economizer and time of day

Delta T Alerts and Diagnostics informs customers when their system is not performing as expected with instructions to contact the dealer - Comes standard with a return and discharge air temperature sensor to measure Delta T.

Alerts and User Interactions Log that keeps a searchable history of alerts and setting changes to the thermostat to determine if there is a system malfunction or if the issue was caused by user error

Performance Logs that keeps a history of heating and cooling performance - The performance log includes Minimum and Maximum Delta T, Minimum and Maximum Discharge Temperature, Minimum and Maximum Return Temperature, Minimum and Maximum Indoor Temperature/Humidity, Minimum and Maximum Outdoor Temperature/Humidity and Run Time

Customizable Service Reminders allow dealers to remind their customers when its time to call for service, when their warranty is expiring and to provide customized alerts

USB port for transferring Installer Setup, Customizable Reminders, Custom Events and Holidays to multiple thermostats or for adding the dealer's full color business logo on the screen

3 assignable outputs to control humidification, dehumidification, ventilation and a stage of heating or cooling - 4 assignable inputs on the Equipment Interface Module can be used with wired outdoor, indoor or discharge sensors, occupancy sensor for remote setback and dry contact devices to trip pre-packaged or custom alerts

Extend wireless range of the Equipment Interface Module by connecting a THM4000R1000 Wireless Adapter (sold separetly) to the ABCD terminals