Upgrading from single-pane to triple-pane windows can save over $500 per year on energy bills.
Upgrading from single-pane to triple-pane windows can save over $500 per year on energy bills.
Meanwhile ENERGY STAR certified windows, doors, and skylights reduce heating and cooling costs by an average of up to 13% nationwide.
What Strafford County Homeowners Should Know About Energy Efficient Window Savings
- Triple-pane upgrade savings: Upgrading from double- to triple-pane windows can improve energy efficiency performance by 40% or more. Triple-pane units carry a U-value of 0.20–0.30 vs. 0.30–0.45 for double-pane windows.
- Draft rating standard: The most energy-efficient windows are ENERGY STAR certified with a 0.1 CFM draft rating.
- Under-insulation problem: Nine out of 10 homes in the U.S. are under-insulated. Windows account for a significant portion of that heat loss — especially older single-pane or builder-grade units that have lost their seal.
- Energy bill context: Drafty windows in winter are one of the most common and costly home performance problems in New England. Replacing failing windows removes an ongoing expense rather than simply adding a new one.
- ROI at resale: Window replacement delivers an 76% ROI nationally, with an average project cost of $21,922. The combination of energy savings and resale value makes it one of the most practical home investments available for the Inland Seacoast climate.
- Financing makes it accessible: Financing available up to 20 years based on credit approval. Make easy and affordable payments!
Choosing the Right Windows for Your Home
Top Pick: Triple-pane ENERGY STAR certified windows for homes replacing single-pane or aging builder-grade units. Savings, comfort, and 40%+ efficiency improvement make them the strongest long-term choice. Coastal Windows & Exteriors is one of the top window companies in Southern NH. Call us for a free estimate!
Worth knowing: Financing up to 20 years based on credit approval makes full window replacement practical without waiting, so you start saving sooner rather than later.
Don’t delay on: Drafty or failing windows — every month you wait is money lost to heating and cooling a leaky envelope that good windows would seal.
Ready to stop losing money through your windows? Coastal Windows & Exteriors is the #1 woman-owned exterior remodeling contractor in New England, with 7,000+ installations across Massachusetts, New Hampshire, and Maine.
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.
Last Updated: April 2026
Sources:
- Upgrading from single- to triple-pane windows can save over $500 per year on energy costs. ENERGY STAR Windows, Doors & Skylights, ENERGY STAR’s resource on certified window, door, and skylight products and their energy-saving potential for homeowners. (Accessed April 2026)
- When upgrading from double- to triple-pane windows, energy efficiency performance can improve by 40% or more. Pacific Northwest National Laboratory How Triple-Pane Windows Stop Energy and Money Flying Out the Window, PNNL’s research on the efficiency gains achieved through triple-pane window upgrades. (2025)
- Triple-pane windows carry a U-value of 0.20–0.30, compared to 0.30–0.45 for standard double-pane windows, and the most energy-efficient options are ENERGY STAR certified 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 insulating glass performance including efficiency ratings and draft standards. (2025)
- Nine out of 10 homes in the U.S. are under-insulated, contributing to significant and avoidable energy loss. ENERGY STAR Why Seal and Insulate, ENERGY STAR’s guidance on the widespread under-insulation problem in American homes and the benefits of sealing and insulating. (Accessed April 2026)
- Window replacement in New England carries an average project cost of $21,922 and delivers a 76% ROI. Remodeling Magazine (JLC Online) Cost vs. Value 2025 – New England, regional cost and resale value data for window replacement projects across New England. (2026)
