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Performance Glass

LandMark Performance Glass Options

Each glass option offers four unique benefits for heating, cooling, visible light transfer and ultra violet (UV) protection. The glass solution for you depends on the climate you live in, the architectural design of your home, and the orientation of your windows to the sun.

High-Performance™ Low-E4® glass

  • 45% more energy-efficient in winter*
  • 56% more efficient in summer*
  • Blocks 84% of UV rays that can damage your drapes, artwork and furniture

High-Performance™ Low-E4® SmartSun™ glass

SmartSun™ is a very energy efficient glass option. It has one of the highest efficiency rating in cool weather and is exceptional in hot climates where solar heat gain can lead to excessive air conditioning expense. SmartSun™ glass lets in almost as much natural daylight as clear glass.


  • 45% more energy-efficient in winter*
  • 70% more efficient in summer*
  • Blocks 95% of harmful UV rays

High-Performance™ Low-E4® Sun glass

Sun glass has the highest rating against solar heat gain coming through your window to help keep your home cooler in warm weather. A tint coating reduces the amount of visible light and sunshine streaming in from the outside.


  • Highest rating against solar heat gain

  • Keeps your home cooler in warm weather

Includes a tint coating to reduce visible light. Our High-Performance™ Low-E4® glass is also available in four pattern options: Obscure Pattern, Reed Pattern, Cascade Pattern and Fern Pattern. Also offered are tempered glass options, heat-treated to be at least four times stronger than regular glass.