I have been using C & J Air Conditioning and Heating Co. for over fifteen years now, and they have always been thorough, accurate, and responsive. Their cost may be higher than their competitors, but we have faith in them because they never gave us a reason to use another company. They installed the system in our old home and are maintaining the one in our new home, which is why they came out this last time. Along with our annual checkup, they also fixed an exhaust pipe that our roofers had damaged. The technicians who were sent out were very courteous and thorough with their work. They've always done a good job and we will continue to use their services.