What HVAC systems is the RTH7600D compatible with?

The RTH7600D is compatible with heat pump systems (with auxiliary heat), heating-only systems, and cooling-only systems, and supports auto changeover between heating and cooling modes. It is not compatible with single-stage heating and cooling, multi-stage systems, warm air furnaces, central air conditioning, heat pumps without auxiliary heat, hot water, steam or gravity systems, floor/wall furnaces, gas fireplaces, pellet stoves, or 120V-240V electric baseboards.