Based on our findings today, it might be time to think about getting a brand new system. Performed diagnostic for upstairs system. Found unit is R22 20 years old with a low charge, found coil completely rusted. Dude to condition of the unit and no possible repairs. Recommended replacing system. Customer agreed to free estimate and would like to find out financing options and install asap. Unit is not operational at this time. Set thermostat to fan on only.