Upon arrival started system in cooling everything turned on and function properly, switched over to heating for the first time this season. Customer stated he had not yet tried the heating this year. Heating kicked on normally and was operational took reading of all our amperage’s and checked our safety and limit switched. All were functional and operational. Filter needed to be changed it was a Merv 11 20x25x5 filter, homeowner had an extra filter so we changed it while there on or visit. Over system was running and functioning properly.