How to Choose the Most Energy Efficient Windows for Your Home

Choosing the most energy efficient windows for your home can lower utility bills, improve comfort, and increase resale value. With so many styles and materials available, it helps to understand what makes one window more efficient than another. Knowing the essential features can help you make a smart investment.

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Understand the Ratings

Energy efficient windows are tested and rated by the National Fenestration Rating Council (NFRC). Look for the window label and pay attention to these key ratings.

U-Factor

Infographic showing the U-Factor scale , explaining how the most energy efficient windows prevent heat loss and perform best with a U-Factor of 0.30 or lower.

This measures how well a window prevents heat from escaping your home. It’s especially important in colder climates where you want to retain indoor warmth during winter months. The U-factor is measured on a scale from 0.20 to 1.20. Lower numbers mean better insulation performance. For the most energy efficient windows, look for a U-factor of 0.30 or lower.

Solar Heat Gain Coefficient (SHGC)

This measures how much solar radiation passes through the window and turns into heat inside your home. A lower SHGC is ideal for hot climates because it limits unwanted heat gain. In cooler regions, a higher SHGC might be beneficial to help reduce heating needs. Choose windows with SHGC values that align with your local climate and sun exposure.

Visible Transmittance (VT)

Infographic explaining Visible Transmittance (VT) using a color-coded scale and a sunlit window, illustrating how the most energy efficient windows balance natural light and heat control.

This rating tells you how much visible light enters through the window. It’s expressed as a number between 0 and 1. A higher VT means more natural daylight, which can reduce your need for electric lighting. However, windows with very high VT may let in more heat. Look for a balance between light and thermal performance.

Air Leakage

Air leakage measures how much outside air seeps in through the window frame. It is scored in cubic feet per minute per square foot of window area. Lower air leakage values mean tighter seals and better energy efficiency. Aim for windows with an air leakage rating of 0.3 cfm/sq ft or lower for optimal performance.

Choose the Right Frame Material

The frame plays a big role in energy efficiency. Common choices include:

  • Vinyl: Affordable, low maintenance, and insulates well.
  • Wood: Excellent insulator with a classic look, but requires upkeep.
  • Fiberglass: Durable and stable in temperature changes.
  • Aluminum: Strong but less efficient unless equipped with a thermal break.

Match the frame to your climate, budget, and home’s style.

Consider the Glass Options

The glass is just as important as the frame. For the most energy efficient windows, look for these features:

  • Double or triple-pane glass: Reduces heat transfer.
  • Low-E (low-emissivity) coatings: Reflect heat while allowing light.
  • Gas fills: Argon or krypton between panes provides better insulation.

These technologies work together to keep your home warmer in winter and cooler in summer.

Get the Right Fit for Your Climate

Homes in colder regions benefit from windows that trap heat inside, while homes in warmer areas need to block heat from entering. ENERGY STAR ratings are climate-specific, so check the zone map to find the best fit for your area.

Think About Orientation and Shading

South-facing windows get the most sun. Use energy efficient windows with low SHGC values in those areas to reduce heat gain. North-facing windows need better insulation but less concern about solar exposure. Adding overhangs, awnings, or landscaping can also help regulate temperature.

Hire a Qualified Installer

Even the most energy efficient windows won’t perform well if they’re installed incorrectly. A trained professional ensures proper sealing, flashing, and placement. Look for certified contractors with experience in energy-saving installations.

Get the Most Out of Your Investment

While energy efficient windows may cost more upfront, the long-term savings on heating and cooling often pay off. Many homeowners also enjoy better noise control, fewer drafts, and a more comfortable indoor environment year-round.

Final Tip

Ask about tax credits or rebates in your area. Many utility providers and state programs offer incentives for installing energy efficient windows.

If you’re ready to upgrade, Let’s Get It Done Contracting can help you find and install the most energy efficient windows for your home. Contact us today for a consultation.