Energy Savings

Window World

Energy Savings with Energy Efficient Windows

Window World's new replacement windows provide substantial energy efficiency and savings for your home. We have saved money and energy for homeowners throughout the nation.

ENERGYSTAR® Qualified SolarZone™ Insulated Glass Package

What Makes the SolarZone™ Insulated Glass Package So Effective?

Since 80% of a window is made of glass, a substantial amount of heating and cooling savings comes from improved glass performance.

  • Our combination of UV-filtering Low-E Glass, insulating argon gas, and a Warm-Edge spacer system creates significant energy efficiency.
  • Together they can cut damaging UV energy, which can lead to faded carpets, curtains, and furniture.
  • The center of glass U-Value of SolarZone Insulating Glass is 50% better than standard insulating glass.
  • In summer, up to a 58% reduction in solar heat gain helps cut air conditioning costs.
  • The result: SolarZone Insulated Glass Packages can help you save on energy and cooling costs while keeping your home more comfortable.

How does Low-E Glass work?

Low-E glass filters long-wave radiation from the sun. This reduces solar heat gain from the sun in the summer...keeping your home cooler:

Image of how Low E Glass Works

Low-E glass takes on a new duty in winter months. It lets warm solar rays into your home...while blocking the heat in your home from getting out:

Image of how Low E Glass Works in the Winter

Duralite® Spacer System


As an industry-leading manufacturer of residential replacement windows, we take pride in our tradition of continuous innovation. Through the utilization of oru Duralite warm edge spacer system, we continue to shape the evolution of the replacement window industry through the development of next-generation, high-performance products.


The non-conductive, Duralite single-seal design is 88% less conductive than metal spacers and is preassembled with an air-filled polycarbonate shim, butyl sealant, three-sided continuous moisture barrier, and desiccated topcoat. The non-metal pieces are then constructed using a unique composite laminating technology that results in consistent, long-term performance.

Duralite spacers optimize the performance of our complete line of high-quality replacement windows and will add value and comfort to any home renovation project. Windows utilizing this unique, warm-edge spacer system feature have:

  • Enhanced comfort and thermal performance. Inefficient windows transfer warm air out of your home in the winter and into your home in the summer. This reduces interior comfort while unnecessarily straining your HVAC equipment and increasing your energy costs. Windows built with our duralite spacer system reduce air transfer, which results in more comfortable and energy-efficient homes.
  • Improved argon gas retention. The Duralite spacer system features a number of high-performance components that provide enhanced argon retention. The spacer utilizes one of the industry’s best argon-resistant adhesives, so the energy-saving gas stays inside the insulated glass unit longer to help reduce overall energy consumption.
  • Reduced condensation. Condensation build-up in windows is most often the result of a poorly sealed insulated glass unit. Condensation can obstruct views, reduce natural light, and increase the risk of mold formation. IGUs built with our Duralite spacer system reduce the likelihood for condensation formation, which allows you to Experience Clarity.™

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