If the ducts of the HVAC system run through unconditioned spaces, what should be done to the ductwork?

When HVAC ducts run through unconditioned spaces, such as attics or crawlspaces, it is essential to insulate them to maintain energy efficiency and ensure optimal system performance. Insulation helps to prevent heat loss or gain in the ducts, which can significantly affect the temperature of the air being delivered to the living spaces. This is particularly important in extreme temperature conditions where the air in the ducts may either become too cold in winter or too warm in summer.

Insulating the ductwork not only helps to regulate the temperature of the air but also reduces the overall workload on the HVAC system, leading to lower energy bills and improved comfort in the home. Proper insulation mitigates the risk of condensation forming on the duct surfaces, which can lead to moisture issues and potentially promote mold growth in the home. In summary, insulating ductwork in unconditioned spaces is crucial for maintaining efficiency, comfort, and the longevity of the HVAC system.