Complete Comfort Heating and Cooling installed a system for me a few years back, and they have been coming out twice a year since then to keep it serviced. They are good about scheduling their visits, and letting me know in advance when they are coming out. They are also good about following up with me, and letting me know about any issues they discover. And, they let me know what they did. I first met them when my old furnace needed repair, and they were willing to come out after hours to help me.