Renew Comfort Club membership. complete 1 system furnace repair and preventative maintenance check. Change 2 16x25x1 filters, check safety and operations. Furnace operating with little high co and only at 78% efficiency and not 80% rated. System ignition also has overheated spot and worn. Suggest to do combustion calibration and replace ignition for a heating system. System operating at this time. Suggest an air purifier system to improve air quality and prevent molding. Give customer estimate.