Rooftop air conditioning system for the whole system, the entire air conditioning system only by the outdoor unit and indoor air hose host of two parts, no pumps, cooling tower, fan coil units and other ancillary equipment, has no condensation drainage channels, installation is very convenient. No moving mechanical systems and indoor plumbing, users do not need to worry about noise and water leakage, and easy maintenance. Unit placed in the roof or outdoor spaces, without machine room, saving the initial investment. Unit without secondary refrigerant system and high efficiency. Section coupled with different functional units, can facilitate the achievement of air purification, dehumidification, cooling, heating, fresh air conditioning and other features.