I paid $285.00 to Tech Services and they did nothing in the servicing of my air conditioner. In fact TS said I needed a new coil. So I got a second opinion from Core. Core told me that the AC needed to be cleaned and serviced and that it would probably last another 5 years. Guess what? The AC is now running perfectly! I think Core is "the best". I am asking TS for my money back!!