After a rocket launch, my air conditioner stopped communicating with the indoor thermostat. I went through all the service tech troubleshooting steps and was unable to get the A/C back working again. I called Able Air, a contractor for Bryant and Carrier air conditioners. The service guy they sent out was named John. John came out for an hour, managed to temporarily get the A/C back working again, although he wasn't quite sure what he did that I didn't also do. After he left, about ten minutes later, the A/C fan was still working, but the outdoor unit was again not communicating. Same problem as before. So I called Able Air again. I talked to John again. He and I agreed that the problem is likely a circuit board that is going bad. His sales guy then calls me and tells me that his serviceperson is named John ... Galt. So we talked about "Who is John Galt?" for a couple of minutes. I am going to see if I can order the replacement board off of EBay.