Conducted comprehensive annual maintenance on HVAC systems today. Inspected and cleaned condenser coils to enhance heat exchange efficiency. Checked refrigerant levels and adjusted as needed to ensure optimal cooling capacity. Lubricated fan motors and inspected electrical connections for tightness and corrosion. Tested thermostat calibration and replaced batteries. Inspected and cleaned air filters to maintain proper airflow and indoor air quality. Conducted safety checks on gas furnaces, including inspecting the heat exchanger for cracks or damage. Completed service checklist to ensure system reliability and efficiency.