i recently had a recommended hvac guy come to the house. It appeared that someone tried to jump my fence and landed on the top of my ac unit outside and damaged it. He replaced the 5 ton compressor with another 5 ton compressor, the run cacitor and condensor fan motor, and added freon. The problem that I am having is that the air will be nice and cold for about twenty to thirty minutes (this time decreases as the day gets hotter) and then warm air blows out. The fan continues to run because the temperature that has been set has not been reached, so then the house warms back up the amount it was cooled off if not a little more in the late afternoon...He has been back and someone else has come over and the freon was checked each time, so there are no leaks. It seems like the compressor is exhausiting itself and quitting. Also, I noticed today when the cold air stops, the outside unit makes a noise like a school bus stopping (the sound of air brakes). I feel like the compressor may be faulty and would like to recommend that he change it out again if that is what the problem sounds like. Any suggestions? (the temp inside gets up to 95 by late afternoon)!

Hello, I have an old Rheem Central A/C, was working fine until one day woke up and unit was blowing warm air. The indoor fan was blowing but outdoors the unit was dead, no fan or compressor. I opened the unit and cleaned out all debris then using a DVM read 240v AC incoming. There was a button on the points which I held down the everything kicked on. Now the unit seems to be working fine. I sprayed the points and all electrical contacts with electrical cleaner/degreaser. The A/C is blowing nice and cold again (+/- 50 degrees). My question is have I just temporarily resolved the problem or did it just need to be reset? If this was just a temporary fix what should I prepare to replace in the future. Thanks Gary