Results with used AC Compressors and Handlers?

[Jon S.]

Has anyone had either good or bad experiences with used central AC units? I came across a used Goodman set compressor and handler for $600; it was used for about a year. The homeowner- who is my neighbor - replaced it for a larger unit after they added heated SF to their house. So it seems lightly used. But I called Goodman to check on the warranty and they said the 5 year warranty is not transferable, that it’s voided if the system is moved. That seems expected. So the question is how risky is it to install used central AC equipment? Is it unethical or unwise to flip a house that has a used AC system? All the ductwork is new. But the value of the house has maxed out the neighborhood and the renovation is way over budget so I’m looking for ways to reduce expenses. Thoughts? Warnings? Experiences? Thank you