I was called to perform a comprehensive HVAC maintenance service to ensure the system operates at peak efficiency. I began by inspecting and cleaning the evaporator and condenser coils, which were accumulating dust and debris, potentially hindering performance. I then checked the refrigerant levels, tightened electrical connections, and lubricated moving parts to prevent wear and tear. Additionally, I replaced the air filter to improve airflow and indoor air quality. After completing these tasks, I tested the system to confirm optimal operation. The HVAC system is now running smoothly, providing reliable comfort and energy efficiency.