Certified Energy Auditor Practice Exam 2025 – All-in-One Resource to Achieve Exam Success!

The most cost-effective way to reduce solar gain through windows is by installing interior shutters. Interior shutters provide a simple yet effective barrier against solar radiation, helping to control the amount of heat and light entering a building. They can be easily adjusted throughout the day to manage sunlight exposure based on the angle of the sun, thus effectively reducing the heat load on the interior spaces without requiring substantial upfront costs or complex installation processes.

While other options, such as installing awnings, using double-glazed windows, or applying reflective film, can also contribute to reducing solar gain, they may involve higher material costs, installation complexity, or permanent modifications to the structure. Interior shutters can be a more flexible solution that caters to varying needs throughout different times of the year. Overall, the adaptability and relatively low investment of interior shutters make them a practical choice for managing solar gain effectively.