System and method for monitoring a filter state of a hvac system in a vehicle

A method for monitoring a filter state of a heating, ventilation and air conditioning (HVAC) system in a vehicle, the method comprising:

• initiating, by a controller, a filter checking mode;
• operating, by the controller, a blower to suck and blow outside air based on the filter checking mode being initiated;
• obtaining, by the controller, temperature information through an outside air temperature sensor configured to determine a temperature of the outside air sucked by the blower and an evaporator temperature sensor configured to determine a temperature of an evaporator, based on the sucked outside air sequentially passing through a filter and around the evaporator;
• analyzing, by the controller, a state of the filter based on the obtained temperature information;
• and
• determining, by the controller, a filter replacement time based on the state of the filter.