My Carrier unit in a courtyard villa developed an evaporator leak two years ago (it was seven years old at the time), and I called the installer, Munns. They came out, ran a leak detection process on the evaporator, fixed the leaks (there were several), ran a pressure test, and the unit is running fine today. I don't recall the cost, but it was certainly way less than a new unit, probably a few hundred dollars.
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