Performed customer 1 system hvac inspection Changed customer supplied (20x20x1) system filter. Customer is selling home. Did full evolution of system. This is a heat pump system unit is 20 years old. Unit is coming on in both heat and ac mode. Tested blower motor capacitor and found blower motor capacitor is bad and blower wheel is dirty. Heat strip for system are coming on properly. Evaporator coil is very dirty and rusted. Condensate pump is working properly, pan switch for emergency drain pan is working properly. Checked outdoor system, capacitor tested good with no issues. Contactor is very pitted. Reattached insulation to suction line.Unit is low on refrigerant. Due to system being obsolete, aged and cost of repairs do recommend updating system. If customer would like to proceed forward with repairs unit needs a leak search, blower motor capacitor, blower wheel cleaning, condenser coil cleaning, contactor, inline flood protection, wet pan switch for extra flood protection. Do not