Which glazing strategy reduces solar heat gain while preserving daylight?

• A. High-performance low-SG glazing (reduces solar gain while preserving daylight).
• B. Single-pane clear glass for all openings.
• C. Opaque walls with no glazing.
• D. Vinyl siding with no insulation.

Answer: (A)

The strategy being tested is using glazing that lowers solar heat gain while keeping daylight. High-performance low-SG glazing is designed to let a good amount of visible light through while reducing the amount of solar energy that enters the space. It achieves this with coatings and sometimes multiple panes that lower the solar heat gain coefficient, so heat from the sun is limited even when daylight is preserved. This keeps interiors bright without overloading cooling loads. In contrast, single-pane clear glass admits more solar energy, opaque walls block daylight, and exterior materials without glazing or insulation don’t address daylighting or heat control.