In an era of increasing energy costs and growing environmental concerns, improving the energy efficiency of buildings has become a top priority. Windows, being a significant source of heat gain and loss, play a crucial role in the overall energy performance of a structure. Retrofitting windows is a cost-effective way to enhance energy efficiency, reduce utility bills, and create a more comfortable indoor environment. In this article, we will explore the benefits of retrofitting windows for improved energy efficiency and the various strategies involved in this process.