Size copper lines for HVAC systems based on tonnage and run
Our refrigerant line sizing calculator helps determine the correct copper line set sizes for mini-split and central HVAC system installations. Proper line sizing ensures efficient operation, adequate refrigerant flow, and oil return to the compressor.
Undersized lines cause pressure drop that reduces system capacity and efficiency. Oversized lines may not maintain proper refrigerant velocity for oil return. The calculator provides recommendations for both liquid and suction lines based on system tonnage, with adjustments for long runs or elevation changes.
This calculator is useful for HVAC technicians, DIYers installing mini-splits, and anyone asking "what size line set for a 2-ton mini split?" Always verify sizing with manufacturer specifications, as requirements vary between brands and refrigerant types.
Follow these steps to size refrigerant lines:
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