In addition to the R22 issue, contractors will insist both sections need to be replaced to meet the minimum SEER. Split ductles systems are consistantly lasting to about 20 years - except for the circuit boards.
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=171958
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