The answer to 'air duct buildup' is that it is a common problem caused by the accumulation of dust, dirt, and other debris in the air ducts of a home's HVAC system. Symptoms include reduced airflow, decreased energy efficiency, and potential health issues from poor indoor air quality. The solution is to have the air ducts professionally cleaned on a regular basis, typically every 3-5 years.
Air duct buildup happens over time as the system circulates air throughout the home. Dust, pet dander, and other particles get trapped in the ductwork, reducing airflow and making the HVAC system work harder. This can lead to higher energy bills and uneven heating/cooling. Neglecting duct cleaning can also allow mold and bacteria to grow, which can negatively impact indoor air quality and cause health problems for occupants.