Heating maintenance in Alpharetta. Tested operation of 2 furnaces. Downstairs system producing high amounts of carbon monoxide, combustion chamber is rusted, flame safety has heavy signs of wear as well as the ignition system, system could use a duct cleaning. Upstairs furnace has no drain line water safety and gas line is not up to code and system could use a duct cleaning as well. Both systems are at end of expected life and replace of downstairs system should be considered. Both systems heating at this time