Energy-efficient windows help in keeping your monthly utility bills low by minimizing the usage of artificial heating and cooling in your home. This is why most homeowners prefer windows that are ENERGY STAR® certified. What makes these types of windows energy-efficient?

Multiple Panes

ENERGY STAR windows have three or more panes for excellent energy efficiency, impact resistance and sound insulation. They’re filled with either air or gas, which provides much better insulation. Depending on which type of window you choose, some have argon, krypton or other gases filled between the panes. We recommend getting gas-filled windows since they insulate much better than air.

Low-E Glass

Low emissivity (low-e) glass uses a transparent coating to reduce the amount of heat passing through the glass while still allowing light to pass through. With ENERGY STAR windows, this coating is nearly invisible, but useful in reducing the U-value of the glass.

The U-value measures how well a window prevents non-solar heat loss or gain. So, the lower the value, the greater a window's resistance to heat flow and the better its insulating value. While a low-e coating on a standard single glazing reduces the heat transfer caused by solar radiation, it does nothing to reduce general heat flow.

Quality Frame Materials 

This means the window consists of a variety of durable low-maintenance framing materials that help reduce heat faster and insulate better. ENERGY STAR windows come in a range of framing materials, such as:

  • Wood - These frames are strong, provide good insulation and are generally favored in historical neighborhoods. The exterior surfaces of many wood windows are clad with aluminum or vinyl to reduce maintenance.
  • Fiberglass - Similar to wood frames, these are just as strong and durable, do not require a lot of maintenance and provide good insulation. They can be either hollow or filled with foam insulation.
  • Aluminum - These frames are durable, low maintenance and recyclable. They typically have at least 15% recycled content. The design also includes thermal breaks to reduce conductive heat loss through the metal.
  • Vinyl - They’re also low maintenance and provide good thermal insulation. Sections may be hollow or filled with foam insulation. Wide vinyl sills may be reinforced with metal or wood.

Only one local company in the area professionally does window installation. Call Illinois Energy Windows & Siding, Inc. at (630) 627-9200. You can also contact us through our convenient online form. We serve Park Ridge, Evanston, Highland Park and surrounding areas.