What makes a Window, Door, or Skylight ENERGY STAR?

ENERGY STAR qualified, windows, doors, and skylights:

  1. Are manufactured by an ENERGY STAR partner,
  2. Are independently tested and certified by the National Fenestration Rating Council (NFRC), and
  3. Have NFRC ratings that meet strict energy efficiency guidelines set by the U.S. Department of Energy (DOE).

Though DOE does not require any specific technologies, certain product features are common in many qualified products.

Performance Criteria

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

Windows Energy Star Map

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 qualified windows, doors, and skylights have some or all of the product features detailed below. But these features are not required.

Efficient Windows


Framing Materials

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

Anatomy of an Energy-Efficient Door

Efficient Doors


Anatomy of an Energy-Efficient Skylight

Efficient Skylights



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