I have had a service contract with Airflow Service Company for about ten years now and, in general, I'm quite happy with them. Their service is good and they come out twice a year when they're due. Their technicians are efficient and knowledgeable. They fix things that need to be fixed and they tell me about things that may become a problem in the future. For the most part, I'm quite happy with them. I first called them after a friend recommended them to me. Their pricing is fair, as far as I can tell, but as I've been with them for so long, I haven't really comparison shopped. But they provide good service and I find them very reliable.