Aug 01, · I'm working on a new construction job at the moment, and we're having some issues with the roofing contractor about where the lines penetrate the roof. Lowest prices on copper refrigerant line sets for HVAC and AC. Copper refrigerant lines are recommended to be changed out when upgrading, /5(). The two copper lines in the set are the refrigerant lines that connect the condenser coil to the evaporator coil. Refrigeration tubing. Includes length of .