This is a Programmable Thermostat for 2H/1C Heat Pump systems and Conventional Single-Stage systems.

This versatile thermostat is designed to give you easy-to-use, push-button climate control. With the classic features you love: clear and easy-to-read backlit display, precise +1/-1 operation, easy menu driven programming, it make sure your heat pump system is performing to the best of its ability and saving energy.

High Compatibility: Heat pump multi-stage systems or conventional single-stage systems, Forced air (gas, oil or electric), Electric furnace, Hot water steam or gravity radiant heat, Heat only systems, Heat pump w/o or with auxiliary or emergency heat, Millivolt conventional systems, Gas fireplaces (24V), Floor or wall furnaces, Cool only systems.(TIP: Before purchasing, check to see if this thermostat is compatible with your system.)
Not Compatible: Two transformer systems, Conventional multi-stage systems, Dual fuel/hybrid heating, Electric baseboard heat (110-240 volts), Line voltage, Convectors, Radiant-ceiling heat, Mini split systems and 12V RV systems.
Easy to Install and Use: Large terminal blocks with universal sub-base, can be installed within 30 minutes, clear, easy-to-read backlight LCD display and easy controls make for a user-friendly experience.
Factory Pre-set Energy-efficiency Program:5/1/1 easy-to-understand programming menus, flexible programming lets you sync your comfort with your schedule.
Simple but Powerful Control: Easy-access front-load battery compartment, adjustable temperature differential (swing) for energy optimization and maximum system life, Support temperature display calibration, Convert °C/°F units, compressor delay protection (selectable on or off).