Performed preventative maintenance for a Goodman heat pump. Observed the system starting normally. Replaced the air filter. Blower motor amps are within range. Evaporator coils and blower wheel are clean. Heat coils are in good condition. Refrigerant pressures are within normal range. Amp draws are 6.2 for the compressor and .7 for the fan. Checked all electrical components needed for heating. The system is operating properly at this time.