PRO non-programmable digital thermostat, 1 heat/1 cool for conventional systems and heat pumps with no auxiliary heat. Dimensions: 3-13/16 inch high X 5-3/8 inch wide X 1-1/4 inch deep (97mm high X 137mm wide X 32mm deep). Mounting: horizontal. Switch position (system): heat/off/cool. Switch positions (fan): auto/on. Premier White®. Display size 1.32 square inch. Manual changeover. Setting temperature range: Heat 40F to 90F; Cool: 50F to 99F (Heat 4.5C to 32C; Cool 10C to 37C).