Abstract: An air conditioning system for mounting on a vehicle roof includes a condenser module and an evaporator module. The condensor module includes an inlet for receiving a compressed fluid, a heat exchanger for condensing the fluid and transferring heat from the fluid, and an outlet for releasing the condensed fluid. The evaporator module includes a deformable base for placement on the roof, that conforms to the roof's curvature. The evaporator module also includes an inlet receiving the cooled condensed fluid from the condensor outlet, an expansion valve for vaporizing the fluid, a heat exchanger for transferring heat to the vaporized fluid, and an outlet for returning the heated vaporized fluid to the condenser module via a compressor. The evaporator module also includes an interchangeable end plate connected to an end of the base, which maintains the base in a shape that conforms to the curvature of the roof.