On most of the Japanese/Chinese/Korean mini-splits out today the expansion device is located in the condenser. So does this mean that the liquid line must be well insulated to keep from losing capacity?
On my unit a few feet of the insulation is really degraded from sun exposure and copper is visible in a few spots. Is this leading to some loss of capacity? (I know another reason to insulate is to keep the lines from sweating, but that's not my main interest.)