Arrived on site, customer stated all was well in regards to the system. Began system evaluation outside at the condenser. Compressor start and run amps were with specs.. Contactor and outdoor fan also both tested within specs. I proceeded to wash the outside condenser coil to prevent dust buildup. Lowering system efficiency. On the indoor unit, I could not replace the filter as the customer did not have one to provide. I informed her of the model of filter she would need and how to replace it. Blower motor start and run amps were within specs. 22° split between supply and return. System left in good working order.