An air-conditioning system for mobility vehicles is capable of introducing outside air into a front portion and a rear portion of a housing in which a heat exchanger is mounted and capable of selectively changing the introduction direction of the outside air, adjusting the amount of heat exchange between the heat exchanger and the outside air depending on the travel direction of a mobility vehicle or whether or not a heat pump is used, thus improving the operational efficiency of the heat exchanger.

Methods for controlling an air conditioning system of a vehicle including a blower unit, a duct, an evaporator, a first heater and a first discharge temperature sensor, the evaporator and the first heater being located in the duct, the blower unit being configured to generate an airflow along the duct at a variable blower speed, the first discharge temperature sensor being configured to output a first discharge temperature sensed from the airflow in the duct located after the evaporator and first heater, the methods comprise: calculating a mass flow rate based on the blower speed of the blower unit; calculating a first heating level of the air conditioning system based on at least one first heater parameter associated with the first heater; and calculating an estimated evaporator operating temperature of the evaporator based on the first discharge temperature, the first heating level, and the mass flow rate.