Performed AC maintenance on Rheem RA1636AJ1NA system. Cleaned condenser coils with Nu-Calgon 4291-08 foam. Checked refrigerant charge using Testo 557s digital manifold. Replaced 45/5 MFD dual run capacitor with MARS 12789. Cleaned evaporator with Nu-Calgon 4171-75 spray. Flushed condensate line using Rectorseal Drain Solve. Replaced air filter with Honeywell FC100A1037 MERV 11. Calibrated Emerson Sensi touch thermostat. System now operating at optimal efficiency with 18°F delta T.