During a HERS rating, which factor is crucial for a home's thermal performance?

The quality and type of insulation is a crucial factor for a home's thermal performance because insulation directly affects the heat retention and transfer within the building. High-quality insulation materials with suitable thermal resistance (R-values) are essential for minimizing heat loss in colder months and heat gain in warmer months. This leads to increased energy efficiency and better comfort levels within the home.

In addition, effective insulation reduces the workload on heating and cooling systems, resulting in lower energy costs and a reduced environmental impact. Understanding the properties of different types of insulation (such as fiberglass, foam, or cellulose) allows the rater to assess how well a home will perform thermally and meets energy efficiency standards.