LineSetCalc™ - Split System AC&HP LineSet Calculator Updated 5/31/18 Provide inputs in the blue boxes, and move sliders.

The fields with the red border are required or invalid.

Refrigerant Compressor Factory pre-charge
Liquid Vapor
Charge Adjust
Total Equivalent Length
Indoor Coil
Liquid Line
Heat Pump 
Horizontal Length
Vertical Height
A tight bend or LR 90°
fitting in the vapor line
is assumed to also be in
the liquid line.
Use of a Tubing Bender
is the preferred method
Pairs of tight
bends or 90°s
Use low stage capacity for 2
stage systems.
Capacity at indoor design
conditions is recommended.
Minimum operation
capacity kBtu/h
Liquid line Calculations
Vapor line Calculations
Line Equivalent Friction
Temperature Velocity
Line Equivalent Friction Temperature Velocity
Size Length (ft) Loss (psi) drop (F) (fpm)
  Size Length (ft) Loss (psi) drop (F)   (fpm)   (oz)    
  For new installations and equipment change outs, lineset sizing is critical for full capacity, efficient operation and a long lasting compessor. Especially important when indoor and outdoor units are separated by a long distance or height. Crankcase heaters, Start kits and Non-bleed (hard shut-off) TXVs or Liquid Line Shutoff Solenoids can prevent premature compressor failure. It is no wonder that equipment manufacturers who include these accessories as standard have a reputation for long lasting quality.  
Adjustable Parameters Min
Liquid Velocity
  Maximum Vapor Line Temperature Drop (from friction loss) °F
Maximum Liquid Line Temp. Drop (from friction loss) °F
R-22 Maximum Total Equivalent Length without "Long Line" protection ft.
 Minimum Riser Vapor Velocity fpm
R-410a Maximum Total Equivalent Length without "Long Line" protection ft.
   Minimum Horizontal Vapor Velocity fpm        Maximum Total Equivalent Length with "Long Line" protection ft.  
                                Maximum Vertical Separation Compressor Below ft.  
                                Maximum Vertical Separation Compressor Above ft.  
Calculations are for prefabricated annealed copper tubing linesets with capacities of 9 to 90 kBtu/h (0.75 to 7.5 tons).
  Liquid refrigerant capacity per foot calculations @105F, Vapor calculations @40F  
  Heat pumps having equivalent lengths over 100 ft, the outdoor piston should be increased one size.   
  The information contained in this calculator represents the opinions and suggestions of Efficient Comfort and the application of the equipment and system suggestions by Efficient Comfort are suggestions and guidelines only. Efficient Comfort does not assume responsibility for the performance of any system as a result of these suggestions. The systems engineer is responsible for the system design and performance.  
Copyright © 2006 - All Rights Reserved.