In ductwork, what is the primary purpose of insulation?

The primary purpose of insulation in ductwork is to minimize heat loss and condensation. Insulation helps to maintain the temperature of the air flowing through the ducts, preventing heat from escaping into unconditioned spaces, which can lead to energy loss and increased heating or cooling costs. Additionally, in cooling systems, proper insulation reduces the likelihood of condensation forming on the outside of the ducts, which can cause moisture issues and promote mold growth. By effectively managing temperature, insulation contributes to the overall efficiency and performance of the HVAC system.

While insulation can have some impact on sound attenuation and might improve the appearance of ducting, these are secondary functions. Structural support is typically provided by duct hangers or brackets rather than insulation, which is primarily focused on thermal management.