Replacement windows play a crucial role in improving energy efficiency by addressing common sources of energy loss. Modern replacement windows are designed with advanced features such as low-emissivity (low-E) coatings, multiple panes of glass, and insulating gas fills. These elements work together to minimize heat transfer, reduce drafts, and enhance insulation. By preventing unwanted heat gain or loss, replacement windows create a more stable indoor environment, reducing the reliance on heating and cooling systems. This, in turn, leads to lower energy consumption and decreased utility costs. Additionally, replacement windows often feature improved seals and weather-stripping, reducing air leakage and improving overall comfort.