Rocky Top Air installed a heating and air conditioning system for me in 2010. Since then I've had a service contract with them for regular maintenance of the system. There have been occasional problems with the system, not of their doing, but they have been here to repair it and ensure that they system is fully operational. They have very good response time and the quality of the work they do is great. They also offer reasonable pricing, so the cost benefit is another draw for me. They are consistently professional and efficient and their technicians are fairly communicative.