What role does HVAC system efficiency play in HERS ratings?

The efficiency of the HVAC system plays a crucial role in HERS ratings because it directly influences the energy consumption of the home. HERS ratings assess a home's energy efficiency based on a variety of factors, and the HVAC system is one of the largest energy consumers in residential buildings. An efficient HVAC system can substantially reduce energy use, which in turn improves the overall energy performance of the home.

When the HVAC system operates effectively, it minimizes wasted energy and, consequently, lowers utility costs for the homeowner. This efficiency is crucial for a lower HERS score, meaning that a home with a high-efficiency HVAC system will perform better in the HERS evaluation than one with a less efficient system. Thus, the statement that HVAC system efficiency significantly impacts energy use and overall home performance accurately reflects the importance of these systems in the overall HERS rating process.