Complete 2 Heating tune up special inspection in Stone Mountain. Find upstairs 17 year old Trane gas not operating with to fail gas valve. Replace gas valve and system operating. Test and find furnace operating with weak flame sensor, worn ignition. Find air distribution box badly molded. Find duct work dirty. Attic have very little insulation. Find Maine level Trane 17 year old gas furnace operating with weak flame sensor, worn ignition. System evaporator coil rusted and air distribution box molded. Find duct system very dirty. System have not water protection. Give customer estimate to install air purifier system, estimate for duct cleaning and repair for 17 year old furnace. Sign cci plan and complete 2 heating maintenance.