Recommended Reading into your heating and cooling system.Ventilators do away with this problem by bringing in refreshing air and generating a rather positive pressure environment in your house.You have established your unit in the lowest setting, but your home stays sizzling, and also you scarcely come to feel any air circulation. So, you put your hand beneath the vents but truly feel little to no air blowing out. This useful source means an airflow difficulty. three. Pressure Imbalance