What should be done if ductwork runs through an unconditioned space?

When ductwork is located in an unconditioned space, such as an attic or unheated basement, it is crucial to insulate the ductwork. Insulation helps maintain the temperature of the air traveling through the ducts, preventing heat loss during the winter or heat gain during the summer. This not only improves the energy efficiency of the heating and cooling system but also enhances comfort in the conditioned areas of the home.

Insulating the ductwork minimizes the amount of energy required to heat or cool the air, which can lead to reduced energy bills. Additionally, it helps prevent condensation on the exterior of the ducts, which can cause moisture problems and potentially lead to mold growth.

While sealing the ducts is also important for preventing air leaks, the primary concern in an unconditioned space is ensuring that the air traveling through them remains at the desired temperature, which is effectively achieved through insulation.