Complete 2 heating maintenance in Stone Mountain. Change both Aprilaire 810 filter, check safety and operations. Find upstairs Rheem gas furnace operating with in manufacturer spec, notice blower wheel not balance, tighten connector to help reduce Vibration, if blower wheel is out of balance again will need to replace. Suggest more insulation in attic. Find downstairs Amana gas furnace operating with in manufacturer spec. Find flame sensor weak and surge to replace. Both system missing inline water protection and bout system gas line not run properly