Heating maintenance in Duluth. Tested operation of 1 system. Discovered blower wheel very dirty. Recommend duct and blower wheel cleaning along with ultraviolet light system to combat organic and viral growth in system and throughout the home. The combustion Inducer motor bearings are grinding and worn out. System is 13 years old and replacement should be considered. System heating at this time. Need to call in 1 month to schedule consultation for replacement during remodel