We performed a comprehensive preventative maintenance service on a residential HVAC system in Rohnert Park. Our team inspected the outdoor condenser unit, the attic air handler, and the furnace to ensure all components were operating at peak efficiency. We conducted thorough electrical testing of the dual-run capacitor, contactors, and control boards to identify potential wear before it causes system failure. During the inspection, we verified refrigerant levels and system pressures using digital diagnostic tools and monitored the burner ignition process for proper combustion. We cleared the condensate drain lines and inspected the interior coils for debris buildup that could restrict airflow. These proactive measures help extend the lifespan of the equipment and maintain consistent indoor comfort throughout the year.