RTS, RTS, RTS: (Sharyn) ALSO SOLD whole house AIR DUCT CLEANING as well. Upon arrival performed maintenance to HVAC system for heating operations, found the 23-year old gas furnace in the basement not safe to operate cause of ( C/O hazards) due to mechanical failures to the heat exchanger.— Also found dirty return air duct system as well. Checked air conditioning system, found the NEWLY INSTALLED (2-year old) unit to be fine at this time. Due to the age and conditions of the 23-year old gas furnace, comfort consultant is requested. Gas furnace was REFERRED TO SALES, comfort consultant is SCHEDULED for later today at 2:00 pm. NOTE: Air duct cleaning is already SCHEDULED to be done on Thursday morning 8:00 to 10:00