Happy with the tune up performed today. The tune up was performed and the water drainage line was insulated as we had problems with it freezing during this year's unusually cold weather. I purchased the furnace a year ago and had questions about the air filter unit. It seems my questions were well founded. It appears that the entire air filter cabinet had been installed upside down. The technician pointed this out to me, and I called to have the installation team back out to reinstall it correctly. Not so happy with the initial installation, but the follow up has been very responsive. Can update when repairs are made.