Modular air conditioning system for electric vehicle

A modular air conditioning system for an electric vehicle is configured as an integrated module that performs in-vehicle air-cooling, in-vehicle air-heating, and battery cooling. The modular air conditioning system includes a dash panel making a division of the vehicle into a power electric (PE) system room in which a PE system for the vehicle is provided and a passenger compartment in which an occupant rides, and a housing provided to pass through the dash panel, wherein a heating and cooling module that supplies conditioned air to the passenger compartment, cools a battery for the electric vehicle, or cools the PE system is provided inside the housing.