Air-conditioning device and system having an integrated heat exchanger

An air-conditioning device of an integrated heat exchanger, the air-conditioning device comprising:

• a housing including a plurality of air outlets and an air inlet through which air circulates;
• an indoor heat exchanger provided inside the housing and including a first heat exchange unit and a second heat exchange unit for heat exchange between a cooling medium and air via circulation of the cooling medium, the first heat exchange unit and the second heat exchange unit being arranged on upper and lower sides, respectively, of the housing, and configured such that a temperature of the air can be adjusted to an identical temperature or different temperatures;
• and
• a heater arranged inside the housing to be spaced apart from the indoor heat exchanger to increase the temperature of the circulating air according to whether or not the heater operates,
• wherein the air outlets of the housing include at least one defrost vent hole and a front vent hole on the upper side of the housing, and at least one rear vent hole on the lower side thereof, wherein the vent holes include a defrost door, a front door, and a rear door,
• wherein the front vent hole is divided into an indoor upper vent hole and an indoor lower vent hole, and
• wherein the front door is configured such that opposite ends thereof are partially cut, and when being positioned to close the indoor upper vent hole, some air flows through the cut portion.