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 to cool the variable speed control and the electric motor ; the at least one air handler for mounting in a cab of the vehicle , remote from the combination module , comprising a respective evaporator coil , each air handler being coupled to the combination module such that refrigerant flows between the air handler 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 to cool the variable speed control and the electric motor ; the at least one air handler for mounting in a cab of the vehicle , remote from the combination module , comprising a respective evaporator coil , each air handler being coupled to the combination module such that refrigerant flows between the air handler 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 . <EOS>