What is the importance of duct sealing in HERS ratings?

Duct sealing plays a crucial role in achieving better HERS ratings because it directly improves the efficiency of HVAC systems. When ducts are not properly sealed, conditioned air can leak out into unconditioned spaces, leading to energy waste and increased utility costs. By sealing the ducts, air is channeled more effectively, ensuring that the maximum amount of conditioned air reaches the intended areas in the home.

This not only enhances comfort but also reduces the strain on the HVAC system, making it work more efficiently, which is a key factor in determining energy performance. A well-sealed duct system contributes positively to a home's overall energy rating, reflecting a lower energy consumption and a reduced environmental impact. Thus, proper duct sealing aligns with the goals of the HERS rating system, which aims to identify and promote energy-efficient practices in home construction and renovation.