If ductwork is located in an attic or crawlspace, what must it be?

When ductwork is located in an attic or crawlspace, it is essential for the ducts to be insulated. Insulating ductwork in these areas helps to prevent thermal loss, ensuring that the conditioned air maintains its desired temperature as it travels through the ducts. This insulation is particularly crucial in unconditioned spaces, like attics or crawlspaces, where temperature fluctuations can be significant. By reducing heat transfer, insulation also improves energy efficiency, making heating and cooling systems more effective and potentially lowering energy costs.

Additionally, insulation helps to minimize the risk of condensation forming on the ducts, which can lead to mold growth or water damage in both the ductwork and surrounding areas. By maintaining the appropriate temperature within the ducts, insulation enhances the overall comfort of the conditioned space. Properly insulated ductwork is, therefore, a critical aspect of HVAC design and installation in ensuring optimal performance and energy efficiency.