NRG is not only super responsive, they are also very sharp in diagnosing and fixing problems. I called his company phone number over the weekend, thinking they would not get back to me until after the holiday is over. To my surprise, NRG called me the next morning and squeezed in an hour to come on weekend to fix my AC. They found the problem quickly with a few diagnostic steps and got them fixed with great skills. The AC started running normally within an hour. This was my 2nd time getting their help and will sure do it again next time!