Arrived for furnace check today. Static pressure is running over the max rating. Heat exchanger has some rust and has hot(black) spots. Carbon monoxide test was 0ppm. There is a 66 degree temp rise. Blower wheel is very dirty. Electrical is running within spec. I checked out the heat pump, you said it was very loud. I turned it on and system started up. The high side pressure was higher than should be. The system never tripped on limit though. There are two TXV’s on system, they control the refrigerant flow. One could be sticking or not opening all the way. I did cycle system twice and it satisfied each time. We could add some AC renew to system to help. This will lubricate the compressor, TXV, and reversing valve, it’s not a guaranteed fix though. I also didn’t hear loud sounds.