Does unconditioned basement ductwork require insulation with the addition of cooling?

When considering ductwork in unconditioned spaces like basements, especially with the introduction of cooling, insulation becomes crucial for maintaining energy efficiency and comfort within the conditioned areas of a home. The requirement for insulation in these scenarios stems from the need to prevent heat transfer, which is particularly significant when cooling is involved.

Insulating the ductwork helps to minimize condensation on the ducts, which can occur when warm, humid air meets the cooled ducts. This not only prevents potential water damage but also enhances the efficiency of the cooling system by ensuring that the conditioned air travels to the intended areas without significant temperature loss.

The phrasing "shall require insulation" indicates a mandate within the code, affirming that insulation is not optional but a necessary requirement under these circumstances. Compliance with this requirement is crucial for the efficient operation of HVAC systems and adherence to building codes.