What is the main purpose of duct insulation?

The primary purpose of duct insulation is to prevent energy loss and condensation. When air travels through ductwork, especially in unconditioned spaces like attics or basements, it can lose significant amounts of energy if the ducts are not insulated. This energy loss occurs due to temperature differences between the air inside the ducts and the surrounding environment. Proper insulation helps maintain the temperature of the air within the ducts, ensuring that heating or cooling is delivered efficiently to the living spaces, thereby reducing overall energy consumption.

Additionally, insulation serves to prevent condensation by keeping the cooler surfaces of the ducts above the dew point when moist air contacts them. This is essential for preventing moisture problems, such as mold growth and damage to ductwork or surrounding structures.

While duct insulation can help reduce noise levels, enhance air quality, or contribute to the appearance of the installation, these are secondary benefits and not the primary function of duct insulation.