Building Permit Glossary
Refrigerant Line Set
The insulated copper tubing that carries refrigerant between an outdoor condenser and an indoor HVAC coil or head.
HVACConstruction types
Applies to
HVAC · Mini splits · AC replacement · Heat pumps
Project example
A mini-split installation routes the line set through the wall, protects the penetration, and connects it to the outdoor condenser.
Also called
line setrefrigerant piping
Where this term shows up in permit work and how it affects the project
Its length, routing, condensate, and electrical disconnect can affect both the mechanical and electrical review, plus the final inspection.
If this term appears in a form, plan comment, or local ordinance, start with the building permit guide, compare it against the zoning permit guide, then use the permit guide directory to find the right local path.