How I Can Tell My Ducts Need Cleaning? To know when it's time to get your air ducts cleaned, there are specific signs you must keep an eye on to avoid any dangerous consequences. When you find any of these signs, make sure to get in touch with expert ductwork cleaners. For instance, you find out that your allergy is acting up or get worse indoors! Is your HAVC system seems inefficient as it works very hard but not giving you what you need? When your electricity bills are higher than usual without changing your usage, your air ducts are the ones to blame. Visible dust & debris buildup in the ducts signifies that you should give Air Duct Cleaning Independence MO a call.