Please bear with me I'll be as descriptive as possible and try not to write a novella.
Home 2 story 4200 sq. ft approaching 10 years old. System is a split unit, with 2 Goodman CPKJ36-1AB units outside and two Goodman A42-10 air handlers in the attic. In the last few years I've replaced contactors and capacitors due to suicidal geckos and ants. I've become familiar with the workings of the units, enough to do troubleshooting.
For the issue I'm dealing only with the upstairs unit at this time. The upstairs unit began freezing up last year and I called in an HVAC tech. He said the unit was low and installed 2lbs of refrigerant which corrected my issue. Now almost a year later I'm having the same issues so I call him back out. Again 2lbs low. He tops the system off and its cooling like a champ. We discuss the slow leak and a replacement in the fall of this year. He discusses the issues with a 10 year old Goodman air handler and the new issues with R22 systems.
Now we get to this past weekend, I set the unit on 76 and go out of town. I get home to find that its 81°F and the output air is 75°F. I check to see if the unit is frozen and its not. I can hear the compressor running and the fan is blowing, the fan in the air handler is running and there is enough suction to hold the filter in place. When I go to the air handler and check the A coil it feels as if only half of both upper and lower coils are cooling. Ive checked the temp on the surface and it varies to ambient air temp on the V end of the coils. We are in the 100s lately but the downstairs unit is not having issues cooling to the set temp.
Where do I start to diagnose or should I just call him back out. I would like to limp this system through to the fall, is finding the leak worth it at this point?
Thanks in advance.