Upon arrival discovered customers system was off at the breaker. Turned breaker on and system started running. Performed maintenance on both of customers systems. He has a basement system and 2nd floor system. Basement is 16x25x1 filter, 2nd floor is 16x20x1. Both systems are approx 18 years old, explained to customer they should consider upgrading soon. Cycled and tested both system, everything working properly at this time. Unable to retrieve numbers from outdoor units. Sunburned.