We have a lifetime warranty on the thermostat we got from One Hour Heating & Air Conditioning and we have not been impressed with their service in the past. The techs we have had in the past would try to push stuff on us that we didn't really need and we didn't appreciate that. We only called them again because we have a warranty. The technician who came out this time though, Darnell, was just excellent ! He replaced a thermostat and gave me other information as needed. He was professional and honest. He was communicative and responsive, and took the time to answer my questions. He's new and he's just a great service provider.