The answer to 'duct cleaning not heating' is that dirty or clogged air ducts can restrict airflow and prevent proper heating. Common causes include dust, debris, pet hair, and even mold buildup in the ductwork. Symptoms may include uneven heating, reduced airflow, and higher energy bills.
In many cases, professional duct cleaning can resolve these issues by thoroughly removing contaminants and restoring airflow. However, there may be other underlying problems like a malfunctioning HVAC system or leaks in the ductwork that require a technician's expertise to diagnose and repair.