I didn't know it would cost so much to find nothing wrong with my A.C., I can say that past experiences were less costly than this one. Nothing was found to have caused my A.C. Unit to freeze up, it would have been good to know that there was a reason for the problem, but there was no reason that was explained to me. The Tech did say he thought there might be a very small leak, which was not detected during his search to find one. I'm satisfied with the the professionalism with any visit from Aspen, but this one did set me back.