Air conditioner system

The utility model discloses an air conditioner system, air conditioner system include off -premises station heat exchanger (5), cross valve (6) and electronic expansion valve (7), off -premises station heat exchanger (5) are falling liquid film formula heat exchanger, and it has last port (51) and descends port (52), the horizontal position who goes up port (51) is higher than the horizontal position of lower port (52), air conditioner system still includes and communicates when refrigeration running state go up port (51) with cross valve (6) and intercommunication down port (52) with electronic expansion valve (7), and communicate when heating running state go up port (51) with electronic expansion valve (7) and intercommunication down port (52) with the auto -change over device of cross valve (6). The utility model provides an air conditioner system has ensured the condensation effect under the refrigeration running state and has heated the evaporation effect under the running state, and then has effectively improved air conditioner system's performance.