We went through a similar situation two summers ago with one of our three heat pumps freezing up. The first company, very reputable, gave us a similar diagnosis as you received...no sense re-
fillling cause system is old blah, blah, blah. They had quotes ready to go for new system options.
Luckily, I had a friend recommend another individual in the business. He identified and fixed a leak in the coils, refilled the system and we've been running trouble free ever since.
Makes me want to learn the trade now that I'm retired!
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