I was able to get an appointment easily and they arrived promptly. They detected the problem and repaired it quickly. A few days later, I encountered another problem and again, I was able to get an appointment easily and they arrived promptly. They recommended some easy fixes and now everything is working well again. I can recommend them without qualification. The guys that came out to my house were great.
High-efficiency condensing furnaces (90% AFUE and above) are a bit more complex than conventional furnaces. The main differences between a conventional and condensing furnace is the heat exchanger technology used to extract heat from the combustion process and the method used to exhaust the combustion gases. In these ways, the furnaces are very different. The condensing furnace does not have a significantly more efficient combustion process than does a conventional furnace; both use gas burners with electronic ignition. The difference lies in that the condensing furnace has a more efficient heat extraction process after combustion.