Today, I performed routine fall HVAC maintenance on a Trane XR15 system to prepare it for the upcoming colder months. I began by inspecting the heat exchanger for any cracks or signs of wear, then checked the blower motor and lubricated the bearings. I replaced the air filter with a new MERV 8 filter to ensure good airflow and improve indoor air quality. Additionally, I tested the thermostat and inspected the flue pipe to make sure the system was properly venting. After conducting a complete system test, I confirmed the HVAC unit is ready for efficient heating this winter.