The company that put my furnace and air in four years ago had Been doing yearly maintenance but when my air was not working in very very hot weather the problem could not be found after two visits I got fed up and called home comfort they were here within the hour the tech was very through and found the problem fixed it and let me know they have 24 hour service if it was not fixed. I did not even know the company I was using had that it was never mentioned so I sat the three hottest weekends this summer in an 80 plus degree house until the next business day so I could call for service. I am very very happy with home comfort. They also respect your house by wearing shoe protectors. Five stars is not high enough praise.