An air conditioning system for a vehicle comprising: a combination module for mounting in the vehicle, the combination module comprising: a condenser coil a fan, a sensor and a compressor assembly, the compressor assembly comprising an electric motor and a compressor, the combination module suitable to be mounted inside the vehicle to cover a hole in a floor or outer wall of the vehicle, the condenser coil, when mounted, being positioned over the hole such that air enters through the hole ventilates the condenser coil, the compressor assembly further comprising a flow controller to control flow of the refrigerant, the flow controller of the compressor assembly coupled to the electric motor and comprising one of a variable speed control and a variable flow control; the compressor assembly further comprising a heat exchanger positioned between the variable speed control box and the electric motor, the heat exchanger receiving the refrigerant returning from at least one air handler (124, 126) to cool the variable speed control and the electric motor; the at least one air handler (124, 126) for mounting in a cab of the vehicle, remote from the combination module, comprising a respective evaporator coil, each air handler (124, 126) being coupled to the combination module such that refrigerant flows between the air handler (124, 126) and the combination module; the fan is mounted proximate to the hole to move air into the combination module; the sensor for taking at least one of temperature measurements and pressure measurements of the refrigerant is near the condenser coil, and a fan controller to selectively activate the fan, when it is determined that air flow in the combination module is insufficient as a function of at least one of the temperature measurements, the pressure measurements and a speed of the vehicle. a combination module for mounting in the vehicle, the combination module comprising: a condenser coil a fan, a sensor and a compressor assembly, the compressor assembly comprising an electric motor and a compressor, the combination module suitable to be mounted inside the vehicle to cover a hole in a floor or outer wall of the vehicle, the condenser coil, when mounted, being positioned over the hole such that air enters through the hole ventilates the condenser coil, the compressor assembly further comprising a flow controller to control flow of the refrigerant, the flow controller of the compressor assembly coupled to the electric motor and comprising one of a variable speed control and a variable flow control; the compressor assembly further comprising a heat exchanger positioned between the variable speed control box and the electric motor, the heat exchanger receiving the refrigerant returning from at least one air handler (124, 126) to cool the variable speed control and the electric motor; the at least one air handler (124, 126) for mounting in a cab of the vehicle, remote from the combination module, comprising a respective evaporator coil, each air handler (124, 126) being coupled to the combination module such that refrigerant flows between the air handler (124, 126) and the combination module; the fan is mounted proximate to the hole to move air into the combination module; the sensor for taking at least one of temperature measurements and pressure measurements of the refrigerant is near the condenser coil, and a fan controller to selectively activate the fan, when it is determined that air flow in the combination module is insufficient as a function of at least one of the temperature measurements, the pressure measurements and a speed of the vehicle.