I have had an Atlas furnace/AC maintenance contract for several years now, and recently they asked if I would review them on Homestars. I'm happy to do so. I use them for two adjacent houses (2 furnaces/ACs) on an annual maintenance plan. They come twice a year for filter and inspection and occasionally a repair. They have been rock solid, including their emergency 24 hour line, which I needed once. Simply put, this is not something I feel I have to worry about. My only wish for improvement would be for them to get into dealing with water heaters too, because that HAS been a major nuisance for me.