An air condition system includes a casing, a first heat exchanger, a fan and a second heat exchanger. A host is held by the casing. The first heat exchanger is disposed inside the casing. Air flows into the casing, and is processed by the first heat exchanger. Then, the air processed by the heat exchange procedure flows forward the host. The fan exhausts the air passing through the host. The second heat exchanger disposed on the fan and inside the casing. The air exhausted by the fan is processed by the second heat exchanger, and flows out of the casing by wind force of the fan.