This digital communicating thermostat provides 3 stage heat, 2 stage cool for traditional or heat pump systems when used with a Honeywell EnviraZone Networked Zoning System. To see which EnviraZone Networked Zoning Systems this thermostat will work with, please see the Accessories tab above. If not intending to use a Honeywell EnviraZone Networked Zoning Sytem, please one of our many other digital thermostat options.