Energy-efficient windows have become more and more popular with homeowners, and it’s no wonder why. Upgrading to energy-efficient windows, especially if you’re making the switch from single-pane or other non-efficient windows, can have a huge impact on your home.

8 Things to Know About Energy Efficient Windows

Windows play a bigger role in the temperature of your home and the cost of your utility bill than you might realize. Whether you’re looking to replace your windows or find a way to lower your utility bills, energy-efficient windows offer an economical solution that doesn’t compromise the amount of light coming into your home.

Here are 8 things that are worth knowing about energy-efficient windows to help you make a decision that’s right for you.

  1. Energy-efficient windows insulate your home from seasonal fluctuations in temperature. According to the U.S Department of Energy, “Heat gain and heat loss through windows are responsible for 25%–30% of residential heating and cooling energy use.” 
  2. ENERGY STAR certified windows include NFRC ratings, which assist in comparing products and understanding a window’s energy efficiency.
  3. NFRC ratings include:
    • U-Factor: rates how well a window traps the heat in a room. When comparing products, look for low numbers.
    • Solar Heat Gain Coefficient: rates how well a window resists heat gain, which is especially relevant during hot summer months or in hot climates. When comparing products, look for low numbers.
    • Visible Transmittance: rates how much natural light a window allows. When comparing products, look for high numbers.
    • Air Leakage: rates how much air leaks through a window. When comparing products, look for low numbers.
  4. If you live in a cold climate, you can further reduce heat loss by selecting gas-filled windows with low e-coatings.
  5. If you live in a warm climate, you can further protect your home from heat gain with specialized coatings.
  6. The insulation provided by energy-efficient windows reduces noise pollution–great news if you have loud neighbors or live on a busy street!
  7. ENERGY STAR calculates that installing energy-efficient windows reduces utility bills by an average of 12%. That amounts to $101-$583 per year after replacing single-pane windows.
  8. The special coatings that protect your home from summer heat doubles as protection from UV light for your valuables. Fading has been shown to reduce by as much as 75%.
  9. About 75% of the sun’s heat comes into your home through your standard double-pane windows. Most energy-efficient windows let in the light you need without the additional summer heat.