The answer to 'air duct cleaning dirty' is that dirty air ducts are a common issue in many homes, often caused by a buildup of dust, debris, and even mold over time. This can lead to poor indoor air quality, increased allergy symptoms, and even reduced HVAC system efficiency.
Some common signs that your air ducts may need cleaning include visible dust or debris coming from vents, musty odors, and increased dust or allergens in the home. Regular duct cleaning, typically every 3-5 years, can help improve indoor air quality and the overall performance of your HVAC system.