Honeywell - FocusPro 5000 Premier White® heating and cooling thermostat for 1 heat/1 cool conventional systems and heat pumps with no auxiliary heat. Dimensions: 3-7/16 inch high x 4-1/2 inch wide x 1-5/16 inch deep (86mm high x 114mm wide x 33mm deep). Standard display size 1.95 square inch. Mounting: horizontal. 20- to 30-volt (AC) or 750 millivolt (mV). Switch positions (system): heat/off/cool/auto. Switch positions (fan): auto/on. Manual changeover. Setting temperature range: Heat, 40F to 90F; Cool, 50F to 99F (Heat, 4.5C to 32C; Cool, 10C to 37C.