What material is commonly used for refrigerant piping in air conditioning systems?

Copper tubing is the most commonly used material for refrigerant piping in air conditioning systems due to its excellent thermal conductivity and corrosion resistance. Copper allows for efficient heat transfer, which is crucial in the refrigeration cycle for maintaining proper cooling. Its flexibility and ease of installation also make it a preferred choice for connecting various components of the air conditioning system, such as the compressor, evaporator, and condenser.

Additionally, copper has a long service life, which is essential for the durability of HVAC systems. It can withstand the pressure variations typical in refrigerant systems without risk of leakage or failure. Furthermore, copper can be easily joined using different methods, such as soldering or brazing, to create secure and reliable connections. This combination of properties makes copper an ideal and widely accepted material for refrigerant lines in air conditioning applications.