The capacitor on my A/C unit failed(you can tell because the top of the capacitor bulges like a coke can in the freezer). I went to several places, but they either would not sell to me(wholesalers) or didn’t have the right part. I brought the failed capacitor in to Transtar, and they brought me a replacement capacitor for $ 38. Replacing the capacitor was simple and took all of ten minutes. According to some Googling, A/C service companies will usually charge you between $ 200-$ 500 for this simple task.