Energy efficient windows reduce heat transfer, stop air infiltration, and lower monthly energy costs. For homeowners, the right window matters all four seasons.
Energy efficient windows reduce heat transfer, stop air infiltration, and lower monthly energy costs. For homeowners, the right window matters all four seasons.
What makes a window truly energy efficient:
- Energy Star 7.0 Certification: The current gold standard for window performance, Energy Star 7.0 certified windows meet strict requirements for U-factor and solar heat gain that most older windows simply can’t match.
- 0.1 CFM Air Infiltration Rating: Our windows carry an industry-leading 0.1 CFM air infiltration rating, stopping the drafts that drive heating bills higher every winter.
- Low-E Glass Coatings: Low-emissivity coatings reduce heat transfer through the glass area, keeping interiors warmer in winter and cooler in summer without sacrificing natural light.
- Multi-Pane Construction: Double-pane windows typically reduce noise by 30 to 35%, and triple-pane windows push that reduction to 40 to 50%, a meaningful benefit for homes near busy roads or rail lines.
- Insulating Efficiency Tops the Demand List: FIXR survey data found that 60% of homeowners name insulating efficiency as the most in-demand eco-friendly feature when choosing windows.
- Real Savings, Real Numbers: Reduced air infiltration alone can cut natural gas or heating oil consumption by 15% according to Energy Star.
What’s the Best Energy Efficient Window for Your Home?
- Top Recommendation: Energy Star 7.0 certified double-pane windows with Low-E coatings and a 0.1 CFM air infiltration rating, the highest-performance option available.
- Best for Maximum Energy Savings: Triple-pane windows, which improve energy efficiency by 40% or more over double-pane when upgrading from single-pane.
- Best for Noise Reduction: Double or triple-pane windows with multi-chamber frames, ideal for homes near busy roads or commuter rail lines.
Ready to upgrade to energy efficient windows? Let Coastal Windows & Exteriors help you choose the right glass package for your home.
Coastal Windows & Exteriors is a woman-owned exterior remodeling company, with 7,000+ installations across MA, NH, and ME.
Request a free window estimate from Coastal Windows & Exteriors.
Browse our complete window FAQ guide from Coastal Windows & Exteriors.
Explore our Window Exterior Remodeling Home Improvement Help Center.
Still have questions about What Are Energy Efficient Windows? See the areas we serve and talk to your local windows contractor.
Last Updated: July 2026
Sources:
- The most energy-efficient windows carry an ENERGY STAR certification with a 0.1 CFM draft rating. China North Glass Soundproofing Benefits of Double vs. Triple Pane Insulating Glass, a technical comparison of double- and triple-pane window performance including draft ratings and U-values. (2025)
- Reduced air infiltration in the home cuts natural gas or heating oil consumption by 15%. ENERGY STAR Why Seal and Insulate, ENERGY STAR’s guidance on the energy savings achieved through reducing air infiltration in homes. (Accessed April 2026)
- Among homeowners surveyed, 60% name insulating efficiency as the most in-demand eco-friendly feature when choosing windows. Fixr Windows and Doors Report, Fixr’s survey data on homeowner priorities and eco-friendly feature preferences when selecting windows and doors. (2025)
- Upgrading to triple-pane windows can improve energy efficiency by 40% or more over double-pane. PNNL How Triple-Pane Windows Stop Energy and Money from Flying Out the Window, Pacific Northwest National Laboratory research on triple-pane window energy performance gains. (2025)
- Double-pane windows typically reduce noise by 30 to 35%, while triple-pane windows push that reduction to 40 to 50%. China North Glass Soundproofing Benefits of Double vs. Triple Pane Insulating Glass, a technical comparison of double- and triple-pane window performance including soundproofing and insulation properties. (2025)
