Complete 2 heating tune up. Change both filter, check safety and operations. Find both heating operating at this time but in poor conditions. Find both system dirty, blower assembly dirty and both motor runstress with high amp with weak blower smc. Both system gas line not up to code( can not have flex gas line inside heater). Both system duct very dirty. Both system return duct under size. Find upstairs have water safety but poor set up and will not water properly and downstairs have no water protection. Upstairs TSTAT operating but damage. Find both system ignition worn, find flame sensor for upstairs furnace weak. Both system produce low level of CO and not efficient due to weak flame. Due to both system age, cleanest, and worn parts making system not reliable. Suggest to upgrade system and not repair. Customer want estimates to upgrade system.