An air conditioning system, comprising: a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger and a further heat exchanger, wherein the further heat exchanger comprises a heat exchanging body, defining a plurality of first micro-channels and a plurality of second micro-channels, a fluid-collecting tube assembly, comprising a first fluid-collecting tube and a second fluid-collecting tube, and an electric control box, comprising a box body, wherein the first fluid-collecting tube defines a first fluid-collecting channel, the first fluid-collecting channel is configured to provide a first cooling medium to the plurality of first micro-channels and/or to collect the first cooling medium that flows through the plurality of first micro-channels; the second fluid-collecting tube defines a second fluid-collecting channel, the second fluid-collecting channel is configured to provide a second cooling medium to the plurality of second micro-channels and/or to collect the second cooling medium that flows through the plurality of second micro-channels, and heat is exchanged between the first cooling medium flowing through the plurality of first micro-channels and the second cooling medium flowing through the plurality of second micro-channels, wherein the further heat exchanger is disposed between the outdoor heat exchanger and the indoor heat exchanger, the compressor is configured to provide a circulating cooling medium flowing between the outdoor heat exchanger and the indoor heat exchanger through the four-way valve, characterized in that the further heat exchanger is arranged on the box body of the electric control box, and the heat exchanger is configured to dissipate heat from the electric control box. a heat exchanging body, defining a plurality of first micro-channels and a plurality of second micro-channels, a fluid-collecting tube assembly, comprising a first fluid-collecting tube and a second fluid-collecting tube, and an electric control box, comprising a box body, wherein the first fluid-collecting tube defines a first fluid-collecting channel, the first fluid-collecting channel is configured to provide a first cooling medium to the plurality of first micro-channels and/or to collect the first cooling medium that flows through the plurality of first micro-channels; the second fluid-collecting tube defines a second fluid-collecting channel, the second fluid-collecting channel is configured to provide a second cooling medium to the plurality of second micro-channels and/or to collect the second cooling medium that flows through the plurality of second micro-channels, and heat is exchanged between the first cooling medium flowing through the plurality of first micro-channels and the second cooling medium flowing through the plurality of second micro-channels, wherein the further heat exchanger is disposed between the outdoor heat exchanger and the indoor heat exchanger, the compressor is configured to provide a circulating cooling medium flowing between the outdoor heat exchanger and the indoor heat exchanger through the four-way valve, characterized in that the further heat exchanger is arranged on the box body of the electric control box, and the heat exchanger is configured to dissipate heat from the electric control box.