What is a common method to prevent condensation in ductwork?

Insulation is a widely employed method to prevent condensation in ductwork. When ductwork carries air that has a different temperature than the surrounding environment, condensation can form on the surface due to the temperature differential. By wrapping the ductwork with insulation, the temperature of the duct is maintained closer to that of the air within, thereby reducing the likelihood of condensation. This insulation creates a thermal barrier that minimizes heat transfer between the air in the duct and the external environment, helping to keep the duct surface temperature above the dew point of the surrounding air.

In addition to insulation, other methods such as sealing duct joints and connections, using heat tracing to maintain surface temperatures, and controlling humidity levels in the air can also help manage condensation, but insulation is particularly effective as a first line of defense against moisture-related issues.