Used AC unit vs New Unit

[Jake Miller]

I have an A/C unit in a quad that will blow cold air for about an hour and then overheat. I've had two people come out to look at it and say I needed to replaced it as it was a refurbished unit when it was installed when I bought  the property last October. I tried to have the home warranty people come out at the recommendation of my realtor and as expected it cost me $60 and they can't do anything until it is broken and will just put bandaids on until it is completely broken.

As he was leaving though he stated he knows a guy that can give me a used a/c unit if I needed. Obviously this situation alone should scare me off of that but it'd be 41% cheaper than buying new. I'm wondering what peoples experiences or recommendations are? I know I should go new but that would essentially knock out all the money I had made since owning it and was hoping to start using it on cosmetic repairs.

Thanks for any insight or advice!