Line-set length of minisplit

Joe Norm| Posted inGeneral QuestionsonFebruary 13, 2020 09:48am

I am wondering if the length of the line-set has any bearing on performance of a mini split?

Single-head Mitsubishi Hyper-heat 18K

The max length I would run the line is about 25ft, not a lot I know. But I could make it even shorter if it was better for the unit?

Thanks

Answer

GBA Prime

Join the leading community of building science experts

Ethan Foley|Feb 13, 2020 10:36am|#1

25' is the standard lineset length, it will have no effect on the rated performance. 40' causes a 2.3% reduction in heating on a FH18NA. What really matters is measuring the refrigerant charge for your INSTALLED length, not a guesstimate.
Joe Norm|Feb 13, 2020 02:57pm|#2

I'm pushing 35-40 feet where I have it planned. I could shift it to reduce this to around 25feet.

Is it worth moving for any gained efficiency?

Ethan Foley|Feb 13, 2020 03:24pm|#3

I guess that depends on if you think 2.3% is worth it. :) I would place it where it works best aesthetically & mechanically (sheltered from snow, minimum clearances, noise, drained condensate, etc.) and not worry about the small efficiency hit.