Abstract: An air conditioning apparatus, capable of cooling, dehumidifying, and reheating air, using refrigeration reheat. The apparatus comprises rooftop unit (1), which includes a standard refrigeration loop for cooling operation. A multiple circuit reheat coil (54), is added in a parallel arrangement with outdoor coil (34), with respect to refrigerant flow. A portion of the hot refrigerant gas of the system is diverted through reheat coil (54) during dehumidification mode, to reheat the supply air to room temperature. A multiple step discharge air control system is included to control multiple stop valves (52) during the dehumidification mode. Reheat coil (54) is arranged in series air flow relationship with evaporator coil (46), so that a mixture of any proportion of outside air and return air may be conditioned. A pressure control (28) is provided to maintain system pressure during all modes of operation.