My past experience, when on component (compressor or air handler) fails, the other one is close to failing. Also, you probably with not be able to get a system warranty unless all of the components are replaced. The newer units have matched components to get maximum efficiency, using and old component, will probably cause a loss of efficiency. I would get 3 or more quotes, and make a comparison based on these, and ask questions (here) on the installers and their warranties.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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