Performed HVAC system changeover from cooling to heating mode for a Trane system in Paterson, NJ. Cleaned the outdoor condenser coil. Inspected refrigerant levels and recharged as needed. Switched the thermostat programming and verified proper operation of the furnace. Checked the heat exchanger, burners, and blower for optimal efficiency. Ensured all safety controls were functioning correctly. The system is now prepped and ready for the upcoming heating season.