The answer to 'why is my air duct mildew' is that mildew can grow in air ducts due to excess moisture, poor ventilation, or lack of regular cleaning. Mildew thrives in warm, damp environments and can spread quickly through the ductwork, leading to poor indoor air quality and potential health issues.
Some common causes of mildew in air ducts include leaks in the ductwork, high humidity levels, and inadequate air circulation. Symptoms may include a musty odor, visible mold growth, and respiratory problems for occupants. To address mildew, it's important to identify and fix the underlying moisture issue, thoroughly clean the ducts, and take steps to improve airflow and ventilation.