Performed routine maintenance inspection on 10 y/o Trane furnace matched with 23 y/o Trane AC that operates for upper level and 10 y/o Trane furnace matched with 21 y/o Trane AC that operates for main level. Checked amp draws. Cleaned flame sensors. Cleared pressure switch tubings. Cleared drain lines. Condensate pump operational. Inducer motor for upper level is bad. No water protection for either system. Blower wheel cleaning needed for both systems. Drain line repairs needed. Vinyl tubing for main level is incorrect. Flue venting for main level is single wall and incorrect. Ductwork is inconsistent and damaged for both systems. Evaporator coils are rusted. Pressure levels were low indicating refrigerant loss. R22 based systems. Condenser electrical components are bad. Main level AC breaker is not properly sized. Informed customer of all findings.