I performed a complete furnace maintenance for a homeowner preparing for the winter season. I started by inspecting the heat exchanger for cracks and cleaning the burner assembly to ensure optimal combustion. I tested the flame sensor and ignition system for proper operation and checked the blower motor for any signs of wear. Additionally, I replaced the air filter and recalibrated the thermostat to ensure accurate temperature control. After testing the system and verifying proper airflow, the furnace was running smoothly and efficiently. The homeowner can now rely on their heating system to perform well throughout the colder months.