Performed maintenance on two gas furnace with AC systems. Replaced both 16 x 25 x 1 filters. Cleared and treated condensate drain lines with fluorinated tablets. Unions added to drain lines for easy clearing/service. Inspected electrical connections and components of equipment. Cleaned outdoor condensing coils units had not been cleaned in a very long time. Both systems are 2005 year models, with R22 refrigerant. At this time, both systems are operating normally. Annual maintenance agreement for two systems is $261 yearly. Annual maintenance agreement/comfort club membership is a bit cheaper if monthly form is completed.