How to handle condensation on ductwork insulation: field troubleshooting experience.

Duct condensation is often not just a case of 'insulation not being thick enough.' I handled a retail project where there were constant water droplets on the outside of the supply duct, and the owner thought the AC was leaking. After opening it up, we found the insulation seams weren't sealed tightly, and there was hot, humid air in the ceiling plenum. Once the cold air started flowing, the…