I performed a comprehensive service on a gas furnace, ensuring optimal performance and safety. The work began with a thorough inspection of the American Standard heating system, identifying any potential issues. I replaced the old filters with new ones to enhance air quality and improve efficiency. Additionally, I replaced the batteries in the smoke alarms to ensure they were fully operational. Safety was a priority, so I meticulously checked for carbon monoxide and gas leaks, addressing any detected issues promptly. The service concluded with a detailed review of the system, ensuring everything was functioning correctly and advising on any necessary maintenance.