Non-Programmable Thermostats For Home 1 Heat/1 Cool Conventional, Stage Systems ?Notice?Please make sure to read the installation and wiring instructions provided in the pictures carefully before buying. If you are inexperienced with installation, it is advised to be cautious when making a purchase to avoid issues like product failure or incompatibility. ?Thermostat Applications?for Single-Stage Gas/Oil/Electric Furnace (Heat only) , Boiler Radiant (Heat only), Furnace Forced-Air (Heat Only), Gas Fireplace (24 Volts) and Single-Stage Cooling. ?Incompatible Systems? Does not work Conventional Multistage Heating Cooling; ACs (2H/2C); HVAC Central Air Conditioner Heat Pumps (2H/1C 2H/2C + 2 stage AUX) and PTACs; 3-wire Hydronic (Hot Water); Dual Fuel/Hybrid Heating?Does not work Line Voltage Systems (120-240V electric baseboards heat); Mini Split Systems; RV Air Conditioners Mach and Roughneck Series. Suuwer S701 nonprogrammable electronic thermostats for house, up to 1 heating and 1 cooling single-stage systems. ( Dual powered by 24VAC power or 2 AAA batteries, No common wire (c-wire) required on most systems ). Easy-to see and read: Display with blue backlight, large clear backlit digital display, very suitable for middle-aged and elderly people. Technical support: Separate heat or cool swing set up (0.2F to 2F) and 5 minute compressor delay protection (Selectable ON or OFF) and Low Battery Indicator. Room temperature calibration adjustment: Accurate temperature control of +/-1-degree F for consistent comfort, (Room temperature display range: 41F to 95F, Temperature control range: 44F to 90F? Friendly service: 2-year worry-free warranty and 24h customer servic. ( Tip: before purchasing please check whether the wiring port of the old thermostat matches )