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I have a 3 ton split to quote on replacing. The old Carrier lasted 31 years. Not totally unusual in the northeast where units don't see the run time that they do in other parts of the country.
Being old school I would like to stay away from microchanell coils. I think Goodman & Ruud may offer some units with copper tube/aluminum fin coils. Any others??
Being in the north east high efficiency isn't a priority