What type of maintenance may be required for a gas furnace to ensure efficiency?

To maintain a gas furnace's efficiency, regular cleaning of the burners and heat exchangers is essential. Over time, dirt and debris can accumulate, obstructing combustion and reducing efficiency. Clean burners allow for optimal fuel combustion, while clean heat exchangers ensure effective heat transfer to the air circulating in the home.

Additionally, changing or installing new air filters is a crucial maintenance task. Clogged filters restrict airflow, forcing the furnace to work harder and leading to increased energy consumption and potential overheating. Regularly replacing air filters allows for a more efficient heating system and improves indoor air quality.

Thus, combining the cleaning of burners and heat exchangers with the timely replacement of air filters ensures that the gas furnace operates efficiently, maximizing performance while minimizing energy costs. This holistic approach to maintenance is reflected in the correct choice.