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how do you assess remaining useful life of a split system?
have a bldg with several split systems (a few York commercial 5 ton units, and a bunch of residential grade systems).
they have been in service for 13 yrs and are serviced by an outside maintenance firm and are used during the summer, and are performing fine.
is there a way to evaluate how long they will continue to perform? would it make sense to have an engineering firm evaluate to units condition and how could they evaluate the units?