Explore Low-E coatings, argon and krypton gas fills, tinted glass, laminated glass, and impact-rated glazing. Understand how modern glass technology improves comfort, efficiency, and safety.
Low-E (low-emissivity) glass has a microscopically thin metallic coating -- typically silver or tin oxide -- that reflects infrared heat energy while allowing visible light to pass through. In winter, it reflects interior heat back into your home. In summer, it reflects exterior heat away. Low-E coatings can block up to 70% of heat transfer through the glass without significantly reducing natural light.
Both argon and krypton are inert gases used between glass panes to reduce heat transfer. Argon is denser than air and reduces thermal conductivity by about 30% -- it is the most cost-effective option for standard half-inch gaps. Krypton is denser still and works better in thinner gaps (3/8 inch), reducing conductivity by about 40%. Krypton costs more but enables slimmer, lighter triple-pane units.
Modern Low-E coatings allow 70-80% of visible light to pass through, so rooms remain bright and naturally lit. The coating primarily blocks infrared (heat) and ultraviolet radiation. You may notice a very subtle tint, but the impact on natural light is minimal. Low-E glass blocks up to 95% of UV rays, which also protects furniture, flooring, and artwork from fading.
Laminated glass consists of two glass panes bonded together with a plastic interlayer (PVB or SGP). If broken, the glass fragments stick to the interlayer instead of shattering. It is recommended for ground-floor windows in high-traffic areas, storm-prone regions, and anywhere enhanced security is needed. Laminated glass also reduces noise transmission by 50% or more compared to standard glass.
Quality windows lose argon gas at a rate of about 1% per year, meaning they retain over 80% of the original gas fill after 20 years. At that level, the window still performs significantly better than an air-filled unit. Reputable manufacturers use dual-seal spacer systems that minimize gas leakage. The gas does not need to be refilled under normal conditions and does not pose any safety risk if it escapes.