I had an appointment between 8-10 am. Alfredo was there at 8:25am. Impressive. He had to repair my 6 yr old downstairs unit and he explained, in detail, what he was doing and how to prevent this from happening again. After that, he inspected my upstairs unit and discovered a problem there. He made a recommendation and sold me a UV light for my upstairs unit. If i have anymore repair work with ARS, I'm going to specifically request Alfredo.