Aube by Honeywell TH149/U Heat and Cooling Non-programmable Thermostat This thermostat is used for the following systems: Heat pump (1-Heat, 1-Cool and 2-Heat, 1-Cool); HVAC (1-Heat and 1-Cool cycle) 1.5-Ampere at 24-Volt Temperature setting: manual , Degree Celsius or Degree Fahrenheit selectable Ultra-compact Dimensions (height by width by depth): 3.1-Inch by 3.2-Inch by 1-Inch