Vortex tube technology should be considered at least for applications when compressed air is available in industrial cooling applications. In difficult manufacturing environments, standard air conditioners have to contend with frequent filter changes, breakdowns and therefore higher repair costs, shorter life, and more frequent refrigerant replacement due to vibration. Vortex tube technology can actually produce temperatures as low as -40 C or even lower in some cases with virtually zero harm to the environment and require very little maintenance.
Pneumatic and hydraulic systems have many similarities. Both pneumatics and hydraulics are applications of fluid power. They each use a pump as an actuator, are controlled by valves, and use fluids to transmit mechanical energy. The differences might surprise you.