AC precision tune up. Clean and tune up AC; cleaned condenser coil, checked all outdoor electrical components, tested indoor air flow, checked refrigerant levels, and tested overall AC operation. Air Exchanger cleaning and tune up. Remove filters and core to vacuum. Also clean cabinet interior. Inspect bearings on blower assembly. Install core and filters. Clean off outside hoods. Test operation of air exchanger. Replaced UV bulb after 2 years per manufacture. Installed Diamond screen to prevent small animals from getting into the exhaust pvc pipe and damaging the furnace and Drain pan treatment to prevent biological growth and help keep the drain line clear. No other recommendations as of now.