I really appreciate all of the input. This has been/continues to be a learning experience for me.I knew nothing about the HVAC process and have just trusted the installer-but look where its got me!
Anyway, when the coil was replaced, as well as the several times the compressor was replaced, he assured me he flushed the lines and took every precaution.Obviously that cannot be right since there have been so many problems. That I know of no copper lines were replaced.
Is it too late to take precautions for the new condensing unit installed 2 months ago? Should I have him come out and re-check the system for acid? Should I insist that a suction line dryer be put on for 72 hours and then re-checked to see if that needs to be repeated? Just want to know where to go from here...