Properly Performed inspection on 2 systems. Replaced/Checked all filters, checked blower wheels for built up dirt/dust, cleaned flame sensors, cleared inducer ports, tested hot surface igniters, took delta Ts, tested all electrical components, tightened all electrical connections, took running volts/amps, monitored systems operations. Both systems have multiple issues. The upstairs system has no wet safety switch, dirty, condenser coil, rusty heat, exchanger, dirty, blower motor, weak outdoor and indoor capacitors. The main floor system has no wet safety switch, no SS1 safety switch, dirty, condenser coil, rusty heat, exchanger, dirty, blower motor, weak outdoor and indoor capacitors, low refrigeration charge.