Why do you need Air Duct & Dryer Vent Cleaning? Air ducts are like the respiratory system for your home’s HVAC unit. When not cleaned regularly, they can become filled with dust, pollen, mildew and other debris that can seriously degrade the air quality in your home. Furthermore, the more things that have the potential to block the airflow, the harder your HVAC has to work to heat or cool the house effectively. This puts tremendous strain on the HVAC itself, and results in higher monthly energy bills for you. Not only should you have your air ducts cleaned, but they should be sealed as well.