It is a light bus air conditioner with wo evaporators. It has advantages including compact stucture w se and power consumption, great cooling capacity reasonable coo ng capacity dstnbuton better matchete top-mounted evaporator has a low-noise cross ow fan, a microchannel evaporator and an F-shaped expansion valve, the front-mounted evaporator hasa laminated evaporator and an H-shaped expansion valve The air conditioner has undergone an opt mization experiment for better compatibility and higher energy effiency. Its cooling capacity is 4.000w to 6.000w