Commissioning a refrigeration system has a significant impact on energy efficiency by ensuring that the system operates at its peak efficiency and minimizing energy waste. This is achieved by verifying that the system is properly sized, installed, and operated, and that all components are functioning correctly and efficiently. Commissioning can also identify opportunities for energy-saving improvements, such as optimizing system setpoints, improving insulation, or upgrading to more efficient equipment. By optimizing system performance and reducing energy waste, commissioning can help to reduce energy costs and contribute to environmental sustainability.