Refrigeration Systems: Installing hangers, piping, insulation, and saddles for commercial rack refrigeration systems and components (e.g., evaporator coils, compressors, condensers) and equipment (e.g., walk-in coolers, freezers, display cases) . As a Commercial Refrigeration Installer, you will play a key role in installing refrigeration systems for a variety of food retail and industrial facilities, such as supermarkets, cold storage warehouses, and food processing plants.