Performed routine maintenance, verified indoor airflow to be good, changed out air filter due to darkness. Checked evaporator coil for cleanliness, verified evaporator to be clean, blower amp draw was good, checked outdoor unit for cleanliness, sprayed down coil checked system components, verified to be good. Customer stated the last time someone did the maintenance the coil froze over after a few minutes of them leaving, so I stayed to ensure a coil was going to remain in operable condition, verified coil was not frozen and still cooling with a client before heading out. Another happy Customer.