Siemer has always been excellent. They installed my furnace and hot water heater several years ago and I have been using them ever since. On the most recent visit, they performed a regular maintenance service on my furnace. The technicians are informative, professional, and pleasant to work with. The utility room is where the furnace, water heater, and dryer is packed into a very tight space. The technicians never complain about that and just do the job. I really appreciate that they answer all my questions with detailed explanations. I will definitely continue to use them in the future.