Global Cooling produces refrigeration systems, cooling systems, industrial chillers, portable chillers, water chillers & portable freezers such as the Free-Piston Stirling Cooler that has high energy efficiency & uses earth friendly cooling substances. The free-piston Stirling refrigeration systems are used for commercial & consumer applications & reduce energy consumption having a positive environmental impact. Only natural working fluids are used providing an advantage over competing systems. The light weight machines have a long life through the use of non-contact running surfaces.