Bill, do you really have experience with a number of mini-splits installed circa 2000? I am not rebutting you, I am actually really hopeful that you do. I hope that you know of a facility with tons of them. The reason for the whole question is because there are so few people who have real experience with these things for 15+ years. In the USA, there is really no-one. We all know instinctively how to handle normal split systems. We are slowly getting to a new time where we will have waves of these which are already R410a with worn out compressors. An old furnace would last 40+ years. You only replaced it if it was 30 to 40+ years old and the outdoor unit compressor died (before R410a required replacements). They are like old cars, replace the guts and keep driving. We have a new beast here. If we do not replace the indoor unit with the outdoor unit, will the indoor unit last another 15 years until the 2nd outdoor unit compressor fails from age? And then we get into multi-splits with one outdoor unit and 4 indoor units to further muddy the water.
source https://www.inspectorsjournal.com/topic/18786-15-year-old-mini-split-systems-if-replacing-the-cu-what-about-the-indoor-unit/?do=findComment&comment=171962
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