What is the significance of properly installed windows in achieving a good HERS rating?

Properly installed windows play a crucial role in achieving a good HERS rating primarily because they reduce thermal transfer. When windows are correctly installed, they ensure that air leakage is minimized and that the overall thermal performance of the home is optimized. This means that heat loss in the winter and heat gain in the summer are both effectively controlled, contributing to improved energy efficiency and comfort within the building.

High-performance windows, especially those that are energy-efficient and feature low-emissivity (low-E) coatings or gas fills, significantly reduce the transfer of heat through the windows. This enhancement decreases the reliance on heating and cooling systems, leading to lower energy consumption and costs. In the context of HERS ratings, a home with properly installed and efficient windows will likely score better due to less energy demand for climate control, reflecting the importance of windows in the overall energy performance of the house.

While other aspects of windows, such as aesthetics, can be considered, their primary contribution to a HERS rating is through their ability to limit thermal transfer and improve energy efficiency. The energy savings they provide directly influence the HERS score, making them a vital component in the assessment process.