Abstract: An air conditioning system includes a shaft rotated by a motor during operation. A compressor having a compressor wheel, an intake port to receive a gas from an external source, and an output port to provide the gas in a compressed state, is connected to the shaft. A turbine including a turbine wheel, an intake port to receive compressed gas, and an output port to provide the gas in an expanded state, is also connected to the shaft. Energy from expansion of the gas from the turbine drives the rotating shaft, and the rotating shaft turn the compressor wheel in order to compress the gas, which exits through the output port.