Abstract: A roof-mounted, modular system of evaporator and condensor units is constructed and designed to be interchangeable with existing condensor and evaporator units on a motorized vehicle, such as, a bus or rail car and can be mounted as a external single system or independently mounted and retrofit for incorporation into the existing air conditioning and circulating system of the vehicle. The evaporator unit is compact and of low design height and is operable in combination with existing condensor units and compressor systems of the vehicle or can be combined with the modular condensor unit. The evaporator contains evaporator coils flanked on either side by heater coils, an expansion valve and control panel as well as the necessary blower fans together with a damper-controlled fresh air/return air system to meet all heating and cooling requirements of the vehicle.

Abstract: A roof-mounted, modular system of evaporator and condensor units is constructed and designed to be interchangeable with existing condensor and evaporator units on a motorized vehicle, such as, a bus or rail car and can be mounted as a external single system or independently mounted and retrofit for incorporation into the existing air conditioning and circulating system of the vehicle. The evaporator unit is compact and of low design height and is operable in combination with existing condensor units and compressor systems of the vehicle or can be combined with the modular condensor unit. The evaporator contains evaporator coils flanked on either side by heater coils, and expansion valve and control panel as well as the necessary blower fans together with a damper-controlled fresh air/return air system to meet all heating and cooling requirements of the vehicle.