I performed a 2 system safety check on 2 gas systems. The furnaces are from 2010, evap coils are 2017 and 2021, the outdoor units are 2010 and 2018. I checked amps, capacitors, filters, electrical, drains, and safeties. The systems are performing to the best of their abilities in their current state. The downstairs has a 5 ton coil with 4 ton outdoor unit, and the upstairs is a 4 ton coil with a 3 ton outdoor. I noticed that the electrical for the upstairs unit is all worn. The capacitor is reading 35/45 on the compressor side, the contactor is ohming out of typical range, and it is starting with high amps. The upstairs outdoor unit needs a chemical bath to ensure it can move air properly. The downstairs outdoor unit is pulling too many amps during start up, also. I found that both blower motors are matted in dust. This results in the motors working harder to perform their jobs and can result in premature failure. I proposed options to address these issues.