I completed spring tune up on a Trane air conditioner. I visually inspected the furnace. I inspected the evaporator coil. I checked the temperature difference across the coil. Checked voltage and amps. Inspected heat pump. Checked refrigerant charge, voltages and amps. I rinsed the condenser coils with water. There were different repairs needing to be done, but the customer insisted on doing it himself.