Aircraft engines are able to provide air conditioning to the cabin by taking bleed air from the 5th and 9th stage of this engines HPC (high pressure compressor) and routed to the ECS bay (environmental control system) where it is cooled by ram air from variable inlet doors and sent through an air cycle machine, heat exchangers, expansion turbines and water separators and is then able to provide conditioned air for the cabin and equipment cooling and without the use of refrigerants like Freon tha