My new 25' lineset came from ComfortUp. I assume they were made by some vendor somewhere.
The insulation was pretty short on the 5/8" line and the flares weren't that great..
But the Gree system seem to be very nice. I just installed a Gree Crown system,
(started it up today) and so far I'm really liking it.
Not sure if the copper tube from HD or Lowes is the 'right stuff'..
I have only purchased 2 systems and both came with line sets.
One line set for a repaired system came from Ebay..
It was made of aluminum with copper tube bonded to the ends..
It's been in service for a few years now, without any leaks..
Some mini-splits ship with two connectors that have been placed on
the service ports, to protect the threads. Plus my Crown system came
with two more connectors in the manual bag..
So, I could have made some DIY lines.. Just would have needed the copper
tubes and the insulation..
Just looked this up and it's less than $80 shipped.. Seems like a good price.
https://www.amazon.com/Line-12000-18...ct_top?ie=UTF8
"Line Set 12000/18000 BTU Mini Split Air Conditioner (1/4” X 1/2") -
All Copper (16 Ft) with Insulation - Flared Fittings/Quick Connect "