Customer led me to unit downstairs in the basement, change the filter on that unit unit seems fine. Customer told me that the condenser was one on the right side of the house by in the back. Turned off all thermostats except for the downstairs Air Handlers thermostat to confirm the correct condenser, that was the right condenser. Unplug the fuse for the condenser, Popped off the top of the condenser and cleaned it inside out pop the condenser on reconnected the disconnect went inside check the temperature difference with temperature probes. Temperature split peaked at 23°.