METHOD FOR CONTROLLING HVAC SYSTEM

A method for controlling a heating, ventilation, and air conditioning (HVAC) system, may include: allowing, by a controller, only the indoor air to be directed into a housing when the HVAC system operates in a cooling mode and an engine is stopped by an Idle Stop and Go (ISG) system; allowing, by the controller, the indoor air directed into the housing to bypass a heater core; and maintaining, by the controller, a flow rate of the air directed into the housing at a minimum flow rate.