Mom and daughter in window still

Understanding What Energy Efficient Window Labels Mean

Mom and daughter in window still

Energy efficient windows are a great addition to your home that can make you more comfortable and keep your heating bills down.

Once you decide to replace your home’s windows, you’ll have plenty of brands and models to choose from. This can be a bit overwhelming if you don’t know which type of windows are right for your home.

Energy efficient windows come with labels, but the average person isn’t likely to understand what they say. Knowing what those labels mean can help you compare windows and choose which features are right for you. You’ll be able to make an informed decision rather than just choosing windows at random or relying on somebody else’s advice.

  • Manufacturer’s Label
    This will include the name of the manufacturer and the model number. It will also provide more information including the frame materials used, the number of panes, the type of gas that fills the gap in multi-pane windows, the glazing style, and Low-E information.
  • NFRC Label
    You should see four or five numbers in a large bold font. These are from an independent organization that tests and certifies the windows. The following numbers will be listed on the NFRC label:

    • U-Factor
      Measures the effectiveness of the windows keeping heat inside your home. Lower numbers mean more energy efficiency during the heating season.
    • Solar Heat Gain Coefficient
      Measures the effectiveness of the windows blocking unwanted heat from the outside. Lower numbers mean more energy efficiency during the cooling season.
    • Visible Transmittance
      Measures the amount of light a window lets in. Higher numbers let more light in which can save you on artificial lighting.
    • Air Leakage
      Measures how much air a window lets in. Lower numbers mean tighter air seals.
    • Condensation Rating
      Measures how well a window can resist condensation. Higher numbers mean more resistance.
  • Energy Star Label
    This label will feature a logo if the window meets guidelines for your geographic area.

To find out more ways to keep your home warm, contact Wolfers Heating at 503-220-1901.