High-Performance™ Low-E4® Glass
High-Performance™ Low-E4® glass, the next generation of energy-efficient, low-maintenance glass.
Andersen Low-E4 glass employs a hermetically-sealed system for optimum insulation from heat, cold and sound. A patented low- conductivity spacer separates the two panes of glass. The space between the two panes is filled with an argon gas blend to minimize thermal transfer. Compared to ordinary dual-pane glass, High- Performance Low-E4 glass is 56% more energy-efficient in summer and 45% more efficient in winter**. Depending on where you live, that can cut your energy bills up to 25%***.
Helps Keep UV Rays Outside
High-Performance Low-E4 glass works like a sunblock to filter ultraviolet (UV) rays that can fade fabric and damage furniture. Ordinary dual-pane glass lets 63% of UV light pass through. High- Performance Low-E4 glass is layered with 11 microscopic coatings that cut UV transmission down to 17% with virtually no effect on the clarity or color of the light that enters your home.
Fewer Water Spots and Easier Cleaning
New Low-E4 glass features an innovative titanium dioxide (TiO²) exterior coating, which makes cleaning easier. When this coating is activated by sunlight, dirt loosens from the glass and can be washed away by rain. The special TiO² coating also makes the glass dry faster with up to 99% fewer water spots*.
Reduces Sound Penetration
In addition, High-Performance Low-E4 glass can also reduce sound penetration when compared to single-pane glass.
Low-E4 glass is exclusive to select Andersen® windows and doors, and is included as a standard feature on all Renewal by Andersen® window products.
*On exterior surface when activated by sunlight.
**Values are based on comparision to U-Factors and SHGCs for clear glass non-metal frame default values from the 2006 International Energy Conservation Code (IECC)
***A study of identical homes comparing Low-E4TM glass to ordinary dual-pane glass showed a 25% savings on cooling bills, 10% on heating. Savings may vary geographically.