York S1-THPU432-Y Programmable Wi-Fi Thermostat is a 7-day programmable thermostat with 3-stage heat and 2-stage cool for residential gas/electric, heat pump, or multistage systems. It has a high-resolution color touchscreen user interface as well as CTS assistant for fast and easy programming. 7 day installer programmable thermostat with occupied/unoccupied periods. Up to 3 stages heating and 2 stages cooling. Remote (hardwired) outdoor temperature sensor capability. CTS assistant for fast and easy programming. Simple operation with easy to read touchscreen display.