Johnson Controls T22JAA-1 Thermostat Cooling Thermostat The T22 line voltage thermostats control heating, cooling, or year round air conditioning units in commercial, industrial or residential installations. Typical uses are for unit heaters, fan coils, blast coils, refrigeration storage rooms, electric heat, duct furnaces, Greenhouses, etc. Models are available with SPST or SPDT contact action for standard duty (nominal 1/4 hp) or heavy duty (nominal 1 hp) applications. Features Sensitive liquid charge element and efficient leverage provides close differential without anticipators.