I conducted a comprehensive maintenance service on the HVAC system, focusing on the Carrier brand. The process began with a thorough inspection of the unit to identify any potential issues. I cleaned and replaced the air filters to ensure optimal airflow. Next, I checked and cleaned the evaporator and condenser coils, enhancing the system's efficiency. I also inspected and lubricated the motor and fan components, ensuring smooth operation. Additionally, I tested the thermostat and electrical connections for proper functionality. Finally, I performed a system diagnostic to confirm that all components were working correctly, providing a detailed report to the client.