Jake Kring. 02-13-25. I arrived for a 21 year old infinity furnace tune up. I spoke with the homeowner and found that the system has been running well but they keep the temperature low at night and turn the system up to 67 deg during the day. I inspected the system and found the return grill to be missing and the blower wheel and coil to be in need of cleaning. The system will cycle on and run in heat normally. The drain on the fur is clear and moving water without any issues. I informed the owners daughter to plan on replacing the system and get it filtered correctly to keep the system running well. I also recommended to replace the system due to age and cost of repairs and cleanings. They wanted to let the system run for now and not do anything to get the system clean at this time.