Refrigerant Line Set Sizing Calculator

What size line set do I need for a 3-ton AC?

For a 3-ton air-conditioning or heat-pump system at a normal length, the tool returns a 7/8 inch suction line and a 3/8 inch liquid line from common R-410A line-set tables. Sizes step up for lower-temperature refrigeration applications because lower vapor density needs a larger suction line to keep oil moving back to the compressor. Always verify against the equipment line-size chart before brazing.

Related questions

• Why does a freezer need a bigger suction line than an AC of the same tonnage?
• Does line-set length affect the size I should run?