What Is a Line Set?
A line set is the pair of small refrigerant lines that connect a ductless mini-split's outdoor compressor to its indoor air-handling unit(s). It's what allows the two components to be installed apart from each other without central ductwork.
Why It Matters to You
Line set length and routing affect where indoor and outdoor units can practically be placed during a mini-split installation.
Practical Guidance
Line sets should be professionally insulated and sealed at wall penetrations — a poorly sealed line set can let outside air and moisture into the wall cavity.
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