I'd already had someone come out, from a company which advertises extensively in San Antonio, to repair my 40-year-old Friedrich furnace/air conditioning system when the AC stopped working, in March 2017. He said the problem was a Freon leak, and the Freon for it was no longer available. All I could do was have a new furnace installed. This would cost about $10,000.
I then called Joe, since I was about to have guests from out of state. He came out on a Sunday and quickly determined that the blower was not working, because a belt was loose. He replaced that belt, and also found that the "run" capacitor was shot. This is a capacitor that kicks on only when it gets extremely hot. He replaced that, too. He found no Freon leak and my air conditioner is working just fine now. While I thought his charge was a little high, at $200, it is sure a lot lower than $10,000, and he did go home and come back to get the new belt. I was very grateful. He said he ordinarily works on big commercial systems. It was clear he knew exactly what he was doing.