I changed a compressor in one of those last month! The air handler was a small unit and would require major work on the rental apartment to change the indoor part of the system. It was a waste of money but no dice on selling a new system. Sure was a challange to cram the new copeland compressor into the small space inside that condenser, but ran like a champ when I was finished. I know what killed the compressor.... cleaned the condenser and evaporator coil's for what I am sure was the first time in 30 some years!! The condenser was completly plugged.