As an A/C contractor for 38 years the whole think sounds suspicious to me. About the only reason you would replace an indoor coil would be if it had refrigerant leak you could not pinpoint or could not repair. The fact that they replaced the outdoor unit shortly after tells me the leak was NOT in the indoor coil and that these guys are just guessing with YOUR money. Hopefully the real leak is not in the lineset joining the two. I would certainly never use them again and unless they have a very good explanation for everything it would be nice for you to post the company's name so others could beware. NO A/C system should need to be replaced after 7 years!
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