Air conditioning system for vehicle

An air conditioning system for a vehicle, the air conditioning system comprising:

• a vent device including a plurality of discharge ports;
• an input device operably connected to an air conditioning device in which an air conditioning area of conditioned air is allocated to each discharge port;
• a temperature sensor configured to detect an indoor temperature or an outdoor temperature;
• and
• a controller configured to store a plurality of determination modes, determine a temperature or a discharge area of the conditioned air depending on a difference between the indoor temperature and the outdoor temperature according to each of the determination modes, and output a control signal to be transmitted to the input device,
• wherein, in a second determination mode among the plurality of determination modes, the controller determines an air conditioning load by comparing the indoor temperature with a target discharge temperature and sets a vertical range of the discharge area by classifying the air conditioning load into stages.