They make it possible to store and transport medicine, food, and other items that must be kept cool. Mechanics follow blueprints and instructions. These blueprints are used to install motors, compressors, condensing units, evaporators, and other parts. They connect the equipment to ducts, refrigerant lines, and power sources. Then they charge the system with refrigerant.
Mechanics diagnose problems when systems break down.
They make repairs, test parts, inspect systems, and overhaul compressors. Mechanics conserve, recover, and recycle refrigerants. These refrigerants are gases used in cooling systems. They must be kept from escaping into the atmosphere. Heating and cooling system mechanics sometimes repair items that were installed by other craft workers.