Line sets consist of two semi-flexible copper pipes to connect the outdoor air conditioner or heat pump to the indoor evaporator coil. The smaller pipe is called the liquid line. The larger pipe is referred to as the suction line, and includes insulation. Line sets come in several lengths and are designed to be cut to fit your exact need.

Line sets consist of two semi-flexible copper pipes to connect the outdoor air conditioner or heat pump to the indoor evaporator coil. The smaller pipe is called the liquid line. The larger pipe is referred to as the suction line, and includes insulation. The liquid line diameter for all standard residential systems is 3/8 inches in diameter. The suction line diameter will be either 3/4, 7/8 or 1 1/8 inches, depending on the size and efficiency of the air conditioner or heat pump. Line sets come in several lengths and are designed to be cut to fit your exact need.

When purchasing refrigeration lines, measure the length of line set needed to connect your outdoor condenser to the indoor forced air equipment. Based on that length, the correct size diameter line set can be selected which will ensure your system meets the listed SEER rating and capacity. Once you have accurately measured the length needed, use our chart below to find the diameter best for your system.

Line sets consist of two semi-flexible copper pipes to connect the outdoor air conditioner or heat pump to the indoor air handler. The smaller pipe is called the liquid line. The larger pipe is referred to as the suction line. Both the suction and liquid lines are insulated on mini-split line sets. The liquid line diameter can be 1/4, 3/8 or 5/8 inches, and the suction line can be 1/2, 5/8 or 3/4 inches depending on the size and efficiency of the air conditioner or heat pump. When installing refrigeration lines make sure you have the correct size line set based on the specifications of the unit. Line sets come in several lengths and are designed to be cut to fit your exact need.

For extended compressor life, if you're running a line set longer than 80 feet you'll need the following accessories:

Crankcase Heater - This will minimize the risk of oil migration during the off cycle.

TXV (Thermostatic Expansion Valve) - This will auto regulate a refrigerant subcooling of around 6° which is ideal for a long lineset.

Hard-Start Capacitor - This will help the compressor during startup with the extra work required from an increased refrigerant charge level.