Cleaning of the ducts shall lead to the removal of plenty of contaminants. As the dirt and dust get removed, it shall also be how there is removal of dust mites, viruses, germs, pollen, and other forms of allergens. This shall not only help keep people safe and healthy, but it shall also save the property therein. Your equipment and furniture should not be exposed to such dirt. Exposure to such dirt will leave most of your property damaged. This is also how you get the HVAC system to function efficiently, as such dirt tends to interfere with that.