Trident Exim

Discussion surrounding copper liner sets varies depending on the application, primarily in HVAC systems, cookware, and industrial uses. In home improvement, it most often refers to HVAC line sets or cookware, each with its own pros, cons, and specific maintenance requirements. 

For HVAC systems

In the context of heating, ventilation, and air conditioning (HVAC), a copper line set consists of two semi-flexible pipes that connect the indoor and outdoor units of a system.