As the working medium of HVACR and refrigeration systems, refrigerant gas circulates to absorb and release heat, realizing cooling or heating functions. Common types include traditional refrigerants like R22, eco-friendly alternatives like R134a and R410A, and natural refrigerants such as ammonia and carbon dioxide. Selected based on system compatibility, energy efficiency and environmental standards, high-quality refrigerants ensure stable heat exchange, reduce energy consumption, and comply with global emission regulations.