I don’t know what type of metering your unit has, TXV or Piston; but it does not make any difference if ½ the A coil is freezing you most likely have plugged distribution tubes in the A coil. Any unit that is freezing over is without a doubt slugging liquid back to the compressor and that compressor is going to die sooner rather than later.
It would be absolute suicide to reuse the old A coil as it is, and only replace the compressor.
If you do not replace the entire unit make sure your HVAC guy knows how to clean up the system.
Make sure your guy knows how to check superheat, subcooling and airflow and is capable of making sure the system is performing to rated capacity before they leave the job.
If the last guy charged you $750 under warrantee and left it with debris plugging up the A coil he obviously never did the required clean up and startup proceecures and would appear to be either unqualified, unethical or both.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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