Les the technician showed up on time and introduced him self. He was clean cut and dressed in a very professional uniform. I explained to him the situation and what i thought i had done wrong. He explained to me that he could resolve the situation and get it corrected. He diagnosed the problem & made me aware of what caused the short in my A/C unit. I also asked him if he could install my new thermostat while he was there and there was no hesitation. When he was done with everything, he came back and explained to me what he did and even showed me how to use my own thermostat. I would recommend ABACUS to everybody and i wouldn't even think twice.