Arrived on site to perform combo tune up on a 2018 AcPro system. Condenser located in back yard. Furnace and Evaporator coil located in attic. Client stated no issues as he just wanted filter replaced. Washed condenser coil inside and out as unit was clogged up. Inspected electrical compartment. Primary was good. Fan motor was good and in range on amps. Compressor start ups are good. Run amp are in range and cooling home good at 19 degrees. Inspected indoor unit. Client still uses 1 inch filter and advised client that he no longer needed standard filter any more as he has a 5 in filter but has not been replaced since last year. Filter has been letting dirt in unit. Advised we need to keep dirt form unit. Motor is good. Blower assembly collecting dust over dirt that has entered. Evaporator coil is good. Drain lines are clear at this time but Advised if dirt keeps entering system it could clog up drain lines over time. Recommend adding a whole house cleaning and purifying system to help