Heating maintenance suwanee. Completed maintenance on 2 systems. Main floor is heating good but has no water safety attached in case of clog. Also is older and not running very efficiently. Upstairs is running good with clean blower and coil. Has both forms of water safety. Changed both filters. Air flow is restricted upstairs due to multiple junctions being used. Suggest redoing ductwork to allow all rooms to come off of plenum to allow optimum airflow.