Add this extra cost to your normal cooling expenses and you may start thinking of installing a new HVAC system. In reality, the issue is probably your ductwork. When you invest in round ductwork, you’re ensuring that there are no unexpected or unnecessary airflow issues. Today, round ductwork is the industry favorite for commercial building owners. Quality spiral ducts complement the best HVAC systems by supporting heating, cooling, and distribution of air in a commercial building.