Sam J - arrived to Silver club member for fall tune up on horizontal furnace in attic. Spoke with customer and she explained that the system has been operating properly with no issues of cold spots in the home. Replaced filter media while testing thermostat operation - 20X30X1. Cycled thermostat off and began servicing system. System has surge protectors installed on furnace and condenser. Removed coil cover to inspect heat exchanger and coil. Coil is clean and heat exchanger is free of any cracks or rust, system recently installed. Cycled system on from thermostat and watched for proper ignition. Then I checked amperage of inducer motor, then blower motor as system went through its sequence of operation. Ducts connected and insulated well, return clean of any trash or debris. Checked temperature difference at plenums and assembled machine. Thermostat satisfied after several minutes after service was complete. Spoke with customer and informed her of the status of the sys