Most people think because one room in the house in not getting enough airflow or maybe it seems hotter or colder than the rest of the house, there airducts are clogged. The answer is most likely not. The majority of the time lack of airflow is actually caused by the furnace or air handler, specifically the “A” coil. The airflow from the home is circulated through the “A” coil where it either cools or is heated, then circulates back through the house. If it becomes clogged with dust and debris, it can no longer run efficiently.