Programmable 5-1-1 day with 4 program periods per day. For heating and air conditioning systems. Universal thermostat conventional and heat pump compatible. Compatible with most electric, gas oil single stage furnaces; heat pumps without backup heat; heat only, and cool only furnaces. Works with 2 Stage or multi-stage heat or cool. Will not work on electric baseboard heat. Precise temperature control +/-1 deg. F. Large backlit display with menu driven programming. Soft-key controls. Shows room and set temperature. Exclusive Smart Response technology. Automatically switches from heat to cool to adjust the pre-heating/cooling. Easy access battery compartment. No. RTH6450D1009/E1: Programmable: 5-1-1 Day Programmable, Width: 5-3/4″, Height: 3-1/2″, Depth: 1-1/4″, Color: Off White, Pkg Qty: 1, Package Type: Clamshell
