As with any system, the ducts in your home are prone to losing efficiency over time. This is due to a buildup of debris, dust, and other things inside of the ducts, restricting airflow. It also leads to a decreased air quality in your home, causing headaches and drowsiness among other things. Because of this, it is a good idea to have regular cleanings of your ducts. There are many companies that offer this service. They usually have a giant vacuum mounted in a van that they will attach to your ducts. By opening and closing ducts, using tools to mechanically dislodge debris as well as chemicals to treat against spores and bacteria in your ducts, you will be left with a duct system that is clean as well as much more efficient.
Having a regular duct cleaning is both good for your health and the health of your home.