The most energy-efficient glass options incorporate Low-Emissivity (Low-E) coatings that reflect infrared light while allowing visible light to pass through, significantly reducing heat transfer. Double and triple-glazed insulated glass units (IGUs) with argon or krypton gas fills between panes provide superior thermal performance, reducing energy costs by 30-50% compared to single glazing. The effectiveness of these systems is measured by the U-factor (lower is better) and Solar Heat Gain Coefficient (SHGC). Warm-edge spacers made from non-metallic materials minimize thermal bridging around glass edges. For maximum efficiency, dynamic glass options like electrochromic glass automatically adjust tint levels based on sunlight intensity and temperature, optimizing energy performance throughout changing conditions. Climate-specific glass selections—low SHGC ratings for hot climates and low U-factors for cold regions—ensure optimal performance for specific geographical locations and building orientations.
