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The 250 Sale · America turns 250 — you save $250 on 10+ windows

The Window Source of New Hampshire

Replacement Windows, Doors & Siding — Installed Right

4.8 across 51 reviews Family owned Lifetime warranty

Free in-home quotes, windows custom-built to your openings, and most installations finished in a single day — by a New Hampshire crew your neighbors already use.

  • Double hungs from $617, installed and in writing
  • Free in-home measure — no obligation, no pressure
  • Lifetime warranty on your windows, fully transferable

Would rather talk it through? (603) 764-7212

★ ★ ★
250
Save $250
10+ Windows
1776–2026
A New Hampshire living room with large replacement windows looking onto the yard

★ The 250 Sale · save $250 on orders of 10+ windows

Get Your Free Quote

No pressure, no obligation — we measure, you decide.

    Locally & Family Owned. Serving MA, NH, & ME.

    Takes about 30 seconds · We never share your information

    • Locally owned & operated A New Hampshire family business — not a call center.
    • Most installs done in a day Measured, custom-manufactured to your openings, installed clean.
    • 4.8 stars across 51 reviews Google and Facebook reviews from your actual neighbors.
    $617 double hungs from, installed
    4.8 51 verified reviews
    1–2 days typical whole-home install
    Lifetime warranty, fully transferable
    New England’s Source For Windows & Doors

    The Window Source — replacement windows and doors across NH, MA & southern Maine

    The Window Source NH installs windows and doors throughout New Hampshire, northern Massachusetts and southern Maine. We are locally owned, and the crew that measures your home is the crew that installs it.

    Best Windows. Best Price. Guaranteed.© We sell factory-direct, which is how a premium, energy-efficient window lands at a fraction of what the big replacement companies quote for the same specs. Ask us to price against any written quote you already have.

    No DIY, no big-box middleman. We measure, custom-order to your exact openings, and professionally install — at factory-direct prices. That is the Window Source advantage.

    What every job includes

    • 100% customer satisfaction guarantee
    • Free in-home estimates
    • ENERGY STAR® rated products
    • Transferable lifetime warranties
    • Independently certified NFRC labels
    • Best value, best price, guaranteed©

    Replacing a front entry door or sliding patio door at the same time? Browse the site, or call and we will talk it through.

    Our Windows

    Double Hung Windows in New Hampshire, Massachusetts, & Maine Double Hung Windows » Siding Windows in New Hampshire, Massachusetts, & Maine Sliding Windows » Bow & Bay Windows in New Hampshire, Massachusetts, & Maine Bow & Bay Windows » Casement & Awning Windows in New Hampshire, Massachusetts, & Maine Casement & Awning » Basement Windows in New Hampshire, Massachusetts, & Maine Basement Windows » Garden Windows in New Hampshire, Massachusetts, & Maine Garden Windows » Colonial Grid Windows in New Hampshire, Massachusetts, & Maine Colonial Grid » Architetural Windows in New Hampshire, Massachusetts, & Maine Architectural Windows »

    Double Hung Models

    Double Hung Windows in New Hampshire, Massachusetts, and Southern Maine

    Harvey Slimline Vinyl Double Hung Windows

    Harvey Slimline Starting @ $545 installed. Enjoy a sleek design and solid energy performance with the Slimline Series 1000 Double Hung. Built locally by Harvey Windows and backed by a transferable Lifetime Warranty.

    Harvey Slimline »

    Double Hung Windows in New Hampshire, Massachusetts, and Maine

    Harvey Classic Vinyl Double Hung Windows

    Harvey Classic Starting @ $617 installed. Our best-selling window — and for good reason. With an outstanding .24 U-Value, durable fusion-welded frames, and double-strength glass, the Classic delivers high-end performance at an unbeatable price. Includes a full Lifetime Warranty.

    Harvey Classic »

    Double Hung Windows in New Hampshire, Massachusetts, and Maine

    Gentek Signature Elite Vinyl Double Hung Windows Series 3000

    Series 3000 Starting @ $587 installed. The Gentek 3000 Series offers strong energy efficiency and durability. Featuring fusion-welded frames, foam insulation, and double-strength glass, this window includes a Lifetime Warranty and great curb appeal.

    Gentek Signature Elite Series 3000 »

    Professional Replacement Installation in New Hampshire, Massachusetts, and Maine

    Gentek Signature Elite Vinyl Double Hung Windows Series 9000

    Series 9000 Starting @ $683 installed. Upgrade to the best in energy savings with the Gentek 9000 Series. Triple-pane glass, Energy Star Most Efficient rating, and tax credit eligibility make this the ultimate high-performance option. Includes a Lifetime Warranty.

    Gentek Signature Elite Series 9000 »

    How It Works

    Three steps, and no surprises in between

    1. Free in-home quote

      We measure every opening and walk the project with you. It is free, there is no obligation, and we leave you a written price — we do not sit at your table until you sign something.

    2. Built for your openings

      Your windows are custom-manufactured to the measurements we took. Nothing is pulled off a shelf and shimmed to fit, which is why an odd size costs the same as a common one.

    3. Installed and cleaned up

      Our own crew installs, trims, and hauls the old units away. Most whole-home jobs finish in one to two days, and the site is clean when we leave.

    Get Your Free Quote

    A Local Family Business
    “To all of our customers; thank you. Our success relies on you and your experience. Your satisfaction has always been, and will always continue to be, our highest priority.”
    Skip Longacre, owner of The Window Source of New Hampshire
    Skip Longacre Owner — The Window Source of NH, MA & ME

    Our No-Pressure Promise

    • Free in-home measure and a written quote, with no obligation.
    • Straight answers — no invented specs, no manufactured urgency.
    • We will tell you when the cheaper window is the right call.
    • 5% off for military, veterans, first responders and seniors.

    Skip is former US military, and that discount has been standing since the day the doors opened.

    What Your Neighbors Say

    4.8 stars across 51 reviews

    Verified Google and Facebook reviews from homeowners across New Hampshire, northern Massachusetts and southern Maine.

    We had two other companies give us quotes but we felt the quality and knowledge of the window source company was the best option for us. … They really did a great job and I’m very happy we decided to choose the window source.
    Kyra C. Google review
    I had several large picture windows and patio doors replaced at a home on the beach. … The business owner came out, took a look, ordered a new window and replaced it with no cost to me. Gracious and professional handling all around. I’m impressed.
    Scott O. Google review
    Window Source replaced our 36 yr old windows. The windows were installed perfectly. Window’s look beautiful and the price was very reasonable.
    Deborah S. Google review

    Read all 51 reviews

    Amesbury Mass Chamber of Commerce
    Synchrony Financing
    The Window Source, Windows Installation & Service, Seabrook, NH
    We Are An American Window & Door Institute (AWDI) Approved Window Installer
    Read Unbiased Consumer Reviews Online at AngiesList.com
    Hampton Area Chamber of Commerce
    Installation Masters
    EPA Lead Safe

    Easy Financing Through Synchrony

    0% Financing for 18 Months*

    A house full of new windows for payments as low as $87/month* — invest now, and start saving on your utility bills this winter.

    Ask About Financing In Your Free Quote

    *Rates and terms dependent on qualifying credit.

    Man pressing face against glass to stare at unbelievable window deal

    Limited Time 250th Anniversary WINDOW SALE!

    Exceptional Value. American-Made. Lifetime Warranty.

    Save Thousands Compared to National Brands

    Whether you're replacing a few windows or doing the whole house, you’ll get unbeatable value without compromising quality. Our Harvey Classic Double Hung is the window for you and our team will make your installation easy and stress-free.

    🏡 Best Window, Best Price — Guaranteed!

    Get Your Free Quote

    *Limited-time offer. Financing available. Free consultations included.

    Homeowner enjoying warmth indoors during winter thanks to new windows

    Our Best Seller For A Reason

    All-Season Comfort. Year-Round Savings.

    Keep the Weather Out — and Your Money In.

    • Exceptional .24 U-Value for Superior Insulation
    • Eliminate Drafts and Cold Spots
    • American-Made Quality with Lifetime Protection

    Harvey Classic Double Hung Windows are built to block summer heat while keeping your home cool and comfortable — all season long. Plus, they look amazing doing it.

    Harvey Classics Starting @ $617 - Installed!

    Get Your Free Quote

    For a limited time, save with our 250th Anniversary Window Sale!

    You'll Love Your Harvey Classic 🪟 Windows.

    Our Service Areas

    Here at Window Source NH we proudly service communities throughout New Hampshire, Massachusetts, and Maine. If you are looking for a window installation company to service your New England home, you found us! Some specific areas we serve are listed below.

    For a more complete list, please visit our service areas page. If you don't see your city on the list, don't worry! We work all over New Hampshire, Massachusetts, and Maine and would love to take your phone call.

    • Rockingham County, NH
    • Hillsborough County, NH
    • Merrimack County, NH
    • Strafford County, NH
    • Essex County, MA
    • York County, ME
    • Cumberland County, ME
    America turns 250 — you save $250 on 10+ windows Free · No Pressure · No Obligation

    Ready to love your windows again?

    Free in-home measure, a written quote, and no one sitting at your table waiting for a signature. Most installs finish in a single day.

    Get Your Free Quote (603) 764-7212

    Double Hung Windows in New Hampshire, Massachusetts, and Southern Maine

    Double Hung Windows

    Series 3000 starting @ $587 installed. We offer the industry's highest quality and value replacement windows available. Whether you need one or three dozen, our professional crew will often offer same day installation.

    Double Hung Windows »

    Double Hung Windows in New Hampshire, Massachusetts, and Maine

    Sliding Patio Doors

    At The Window Source we offer replacement doors for your home. Whether you need front or a sliding patio doors for your home, then call the window and door installation professionals at The Window Source.

    Front Doors »
    Sliding Patio Doors »

    Professional Replacement Installation in New Hampshire, Massachusetts, and Maine

    5 Star Professional Installation

    Our customers consistently give us five star ratings because we are professional, care about your time & space, and ensure that your home gets the best product installation available in the industry.

    Contact Us Now »

    The 250 Sale — save $250 on 10+ windows · windows from $617 installed

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    What Our Customers Say

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