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Standard Split System Line Sets

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.
Long Lineset Diagram
For extended compressor life, if you're running a line set longer than 80 feet you'll need the following accessories:
  • 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.
Want to cover up the line set outside your home so it blends in with your home's exterior? Check out our line set covers which will hide the line set and preserve your home's tidy look.
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  • Alpine 61280251

    25 Foot 3/8 LL 3/4 SL Line Set

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    $124.99
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    (45 Reviews)
  • Alpine 61280351

    35 Foot 3/8 LL 3/4 SL Line Set

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    $166.99
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    (45 Reviews)
  • Alpine 61280501

    50 Foot 3/8 LL 3/4 SL Line Set

    $212.99
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    (45 Reviews)
  • Alpine 61480251

    25 Foot 3/8 LL 7/8 SL Line Set

    $159.99
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    (45 Reviews)
  • Alpine 61480351

    35 Foot 3/8 LL 7/8 SL Line Set

    popular
    $217.99
    In Stock

    Or as low as

    (45 Reviews)
  • Alpine 61480501

    50 Foot 3/8 LL 7/8 SL Line Set

    $286.99
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    (45 Reviews)
  • Alpine 61880251

    25 Foot 3/8 LL 1 1/8 SL Line Set

    $217.99
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    (45 Reviews)
  • Alpine 61880351

    35 Foot 3/8 LL 1 1/8 SL Line Set

    $283.99
    In Stock

    Or as low as

    (45 Reviews)
  • Alpine 61880501

    50 Foot 3/8 LL 1 1/8 SL Line Set

    $388.99
    In Stock

    Or as low as

    (45 Reviews)