I was very impressed with my service. The serviceman called to let me know hw was coming in half an hour. I put my dog in the kitchen and did not even bark at him. He was kind. He did a good job cleaning my heater. I asked several questions and he was knowledgeable and communicated well. He even helped me change my batteries in my thermostat. When completed, he gave me information about function of my heater and told me my ventilation was adequate. This gave me reassurance.