Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. Dirt affects all three basic components of your furnace, so cleaning is the most important part of regular maintenance. The three parts of the furnace should be cleaned: the filter system, the blower, and the motor.you need to understand that cleaning the furnace is really an important part and the more you will be prompt in the same, the more effective and efficient the operation of the furnace will be. During normal operation of the furnace, dust can accumulate in ductwork that can lead to microbial growth. Timely cleanup ensures that you breathe clean air and this is also safe for the health of your family. It also helps you to save on the energy consumption and it may increase efficiency as much as 40 percent!