Line sets consist of two copper tubing lines for connecting the outdoor air conditioner or heat pump to the indoor evaporator coil. The smaller tube is called the liquid line. The larger tube is referred to as the suction line, and includes insulation.
The liquid line diameter is available from 1/4" to 3/8" inches in diameter. The suction line diameter is available in sizes from 3/8" to 1 1/8" inches, depending on the size and efficiency of the air conditioner or heat pump.
Line sets are available in lengths of 15', 20', 25', 30', 35', 40', 50' or 60'. Insulation thickness is available from 1/4" to 3/4".