Intermatic CA8900 InTouch Wireless Control Thermostat,Intermatic,CA8900" /> Compatible with all standard 24 VAC heating and cooling systems, up to two stage heat, one stage cool, and two stage heat pump Fully zwave compliant including the new zwave energy save command classes Interoperable with all zwave compliant controllers and devices Can support a full 7 day schedule when used in conjunction with CA7100 and CA5500BR, set it, forget it Supports save energy mode