Accomadates heating/cooling, fossil fuel, heat pumps, geothermal, fan only, programmable or non-programmable operation, controls humidifiers and dehumidifiers, and even sends maintenance reminders. The large 10.3 sq in touchscreen displays current indoor and outdoor temperatures and indoor relative humidity (on-board sensor), set temperature, time & date, system controls, and messages. The large font size and bright backlight make it easy to read. Build a network using multiple thermostats, indoor and outdoor temperature sensors, a distribution panel (APR-8819), and temperature (APR-8081) or temp/humidity support modules (APR-8082). Connect to your home automation system with the Protocol Adapter (APR-8811). Thermostat is powered by the 24VAC HVAC circuit with two AA batteries (included) as the backup power source.

Links:
Install Manual	Owners Manual	Data Sheet