Thank, Kok, that's helpful. That capacitor was really iffy, but what was I supposed to do? I was going to hover when he was playing with the unit, but before I got out there, he was walking back with a test meter and a capacitor he supposedly (out of his pocket) that didn't register anything.
I don't think there's anything wrong with the thermostat. I bought it in 2009 and swapped out the piece of junk in my apartment. When I had a pre-walk-thru, the manager said, "Oh! I didn't know we had those. Nice." I said, "No, no, no! Yours in in the drawer and I'll reinstall it. That one is mine and it's coming with me." She was so disappointed.
Honestly, I think my insulation likely sucks. It looks like a home job up there (the former owner was a DIY, but not a very good one) with pink snowdrifts rather than an even, cohesive dispersement. When the a/c first starts on a really hot day, I get a blast of hot air first. I'm considering getting radiant barrier, but in the end my electric bill never reaches $200 a month, so I don't feel this strong motivation to invest.
I may just wait to see if the condenser goes out and then it will be under my home warranty. Yeah, that's the ticket. What can I tweak to make that happen that won't be obvious?