What is required for unconditioned basement ductwork with the addition of cooling?

When dealing with unconditioned basement ductwork that is part of a cooling system, insulation is indeed required to prevent condensation and ensure energy efficiency. In unconditioned spaces, ductwork can be subjected to temperature fluctuations that may lead to condensation forming on the ducts when warm moist air contacts the cooler surfaces.

Insulating these ducts helps to maintain the temperature of the air within the ducts, reduces energy loss, and minimizes the risk of moisture-related issues, such as mold and mildew growth, which can be particularly problematic in basements. Proper insulation also assists in maintaining the efficiency of the cooling system by reducing the workload on the system as it doesn't have to cool additional heat gain from the surrounding unconditioned space.

Therefore, requiring insulation for unconditioned basement ductwork when cooling is also utilized aligns with best practices in mechanical system design and energy efficiency standards.