We had a boiler that was not working properly. I called and was told that a technician would be available later that afternoon. I received a call not long after that initial call and was told the technician finished early and was on his way. He could have just come and fixed the problem we were having, which he did rather quickly, but he stayed and inspected the boiler and the flue and gave us a complete report so we can make an informed decision about that boiler in the future. Amazing service. I cannot say enough good things about Frontier Heating & AC Service. I highly recommend.