Energy Star

Benefits of ENERGY STAR Qualified Windows, Doors, and Skylights

Save money — and more

Installing ENERGY STAR certified windows, doors, and skylights lowers energy bills and saves you money. With more efficient windows, you also use less energy, which reduces greenhouse gas emissions from power plants and homes.

Get comfortable

Put an end to cold drafts and overheated spaces. ENERGY STAR certified windows, doors, and skylights keep your home’s temperature consistently comfortable. Even your loveseat right by the window can be cozy with ENERGY STAR.

Protect your valuables

Low-emissivity coatings on many ENERGY STAR certified windows, doors, and skylights reduce UV sun damage to floors, carpets, and furniture.

Certified performance

All Energy Star windows, doors, and skylights are certified and verified to perform as labeled.

Average Annual Cost Savings When Replacing Windows

What makes it ENERGY STAR?

ENERGY STAR qualified, windows, doors, and skylights:

  1. Are manufactured by an ENERGY STAR partner,
  2. Are independently tested, certified, and verified by the National Fenestration Rating Council (NFRC), and
  3. Have NFRC ratings that meet strict energy efficiency guidelines set by the US Environmental Protection Agency (EPA).

Though ENERGY STAR does not require any specific technologies, certain product features are common in many certified products.

Performance Criteria

Windows, doors, and skylights protect you from the elements just like a winter coat. But like a winter coat, you should pick the windows, doors, and skylights that make the most sense for your climate. While some windows, doors, and skylights are better at keeping you warm, others excel at keeping you cool.

Performance criteria for windows and skylights are based on ratings certified by the National Fenestration Rating Council (NFRC), and vary for each of the climate zones shown in the adjacent map. To find the climate in which you are located, search here.

Doors are a little different. Many doors don’t have any glass (like your front door), but even doors with lots of glass (like a sliding patio door) have lower glass-to-frame ratios than windows or skylights. This means doors can provide more insulation than a window or skylight can. Performance criteria for doors are based on the amount of glass they have (called glazing level) and ratings certified by the National Fenestration Rating Council (NFRC).

Common Product Features

Many ENERGY STAR certified windows, doors, and skylights have some or all of the product features detailed below. But these features are not required. Learn more about what makes it ENERGY STAR.

Anatomy of an Energy-Efficient Window

Framing Materials

ENERGY STAR certified windows come in a variety of framing materials.

  • Fiberglass frames are strong, durable, low maintenance, and provide good insulation. Fiberglass frames can be either hollow or filled with foam insulation.
  • Vinyl frames are 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.
  • Aluminum frames are durable, low maintenance, recyclable, and typically have at least 15% recycled content. Frame design typically includes thermal breaks to reduce conductive heat loss through the metal.
  • Wood frames are strong, provide good insulation, and are generally favored in historical neighborhoods. The exterior surfaces of many wood windows are clad (or covered) with aluminum or vinyl to reduce maintenance.
  • Combination frames use different materials separately throughout the frame and sash to provide optimal performance. For example, the exterior half of a frame could be vinyl while the interior half could be wood.
  • Composite frames are made of various materials that have been blended together through manufacturing processes to create durable, low maintenance, well-insulated windows.

To learn more about efficient window technologies, visit the Efficient Windows Collaborative.

Anatomy of an Energy-Efficient Door

Anatomy of an Energy-Efficient Skylight

Contact Us For More Information About Energy Efficient Window Replacement for Your Home

For Window Installations and Replacement Windows and Doors
in North Carolina, Contact Us Today.

919-231-7181