Home buyers inspection of both HVAC systems. Tested in heating and cooling from thermostat and found multiple issues with both systems. The main level system has an AC unit from 2008 that still uses R22 refrigerant and has failing starting components. Also checked the heat exchanger of this unit unit and found that there are cracks in the heat exchanger which can be a carbon monoxide and fire risk to the home. Both systems have signs of lack of maintenance due to dirty coils inside and outside along with dirty ductwork. The upstairs unit has signs of poor installation practices the return and supply Plenum are in very bad shape along with the drain line. Neither of these units have proper flood protections in the main level also has failing starting components for the AC.