I just got my epa certification a few months ago, and as my username indicates, I don't have much experience outside of the classroom.

I am working on my own 2.5-ton Carrier Tech 2000 unit. We bought this house two years ago & the units are old, but were working well until recently. They do not have txv. I am only tinkering with the upstairs unit because downstairs feels cool - July is not the time for me to be learning on it.

Upstairs was putting out lukewarm air and had low pressure on both sides. I added a small amount of r22 and cooling improved. I also tried to locate the leak, but was not successful.

Right now my low & high side pressures are around 68psi. That makes me think the valves in the compressor are bad, but I am getting cold air (61) in the house. Superheat is a little high - about 20 degrees when it should be 15.

Is it possible that my gauges are crappy? They read equal pressure for both units, even though my downstairs is cooling.

Thanks for any help.