Performed fall maintenance on Daikin FIT heat pump system with gas furnace backup in Denton. Cleaned outdoor coil using coil cleaner and low-pressure rinse. Checked refrigerant charge, topped off R-410A. Cleaned condensate drain line with compressed air. Replaced air filter with MERV 11 pleated filter. Inspected ductwork and sealed accessible leaks with mastic. Cleaned flame sensor and checked ignition sequence on furnace. Calibrated Daikin One+ thermostat. Installed Daikin premium air purifier. Conducted static pressure test and adjusted blower speed for optimal airflow. Left system in peak condition for heating season.