What is one of the main purposes of duct insulation?

The primary purpose of duct insulation is to prevent air leakage. Properly insulated ducts help maintain the temperature of the air traveling through them by reducing heat loss or gain. This is especially important for systems that transport conditioned air, such as heating and air conditioning units. Insulation minimizes the temperature difference between the air inside the duct and the surrounding environment, leading to increased energy efficiency and comfort in the conditioned space.

While shaping ducts, reducing noise levels, and enhancing structural support are important aspects of ductwork design and installation, they do not specifically address the primary function of managing air temperature and preventing energy loss as insulation does. Insulation directly impacts the efficiency of the HVAC system, helping to ensure that the air reaches its intended destination at the desired temperature without unnecessary loss of energy.