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Take $500 off each installed window or door.

Plus, $0 Down, 0% Interest, 0 Payments for 12 Months.

Take $500 off each installed window or door.
Plus, $0 Down, 0% Interest, 0 Payments for 12 Months.

Minimum purchase of four or more windows or doors to receive $500 off per installed window or door. Offer not valid on previous purchases. $0 Down, 0% Interest, and 0 Monthly Payments for 12 Months Financing offers a no payment—no interest feature (during the “promotional period”) on your purchase at the interest rate set forth in your loan agreement.

No finance charges will accrue on your account during the promotional period, as set forth in your Truth in Lending Disclosures, and you will not have to pay a monthly payment until the promotional period has ended. If you repay your purchase in full before the end of the promotional period you will not have to pay any finance charges. You may also prepay your account at any time without penalty. Financing is subject to credit requirements and satisfactory completion of finance documents.

Any finance terms advertised are estimates only. Normal late charges apply once the promotional period has ended. Financing requires minimum purchase of $12,000. May not be combined with other offers, discounts, or promotions. No cash value. Offer valid only for installed product purchased directly from Infinity Replacement. Offer expires January 31, 2026. See details and license info at install.infinitywindows.com.

Rustic living home interior featuring tall, black Infinity windows.

Schedule a complimentary, no-pressure consultation with Infinity Replacement in New Hampshire today.

No commitment — just expert guidance and a custom quote.
Details

No commitment—just expert guidance and a custom quote.



We’ll review your current windows and doors, help with design ideas, and take measurements for pricing. You’re free to decide how (or if) you want to move forward.


If you don’t see a time that works for you, please call us at 866-922-2119.

By continuing, you agree to Infinity Replacement’s Terms of Use & Privacy Policy. By providing your phone number, you agree to be contacted by voice or SMS to schedule or follow up your appointment.

An Infinity by Marvin window installer works on replacing a window inside a home.

Design Consultation

New Hampshire window and patio door replacement

Infinity Replacement sells and installs custom-built Infinity by Marvin windows and patio doors tailored to your home with expert guidance and a dedicated customer success manager handling every detail.

Assess current windows and doors

Your consultant will evaluate your current windows for moisture issues, water damage, rot, or structural concerns. They'll also note any energy efficiency or functional issues.

Select installation method

Depending on the condition of your existing windows, they will determine if it's a redesign with a full-frame replacement or one-for-one insert replacement.

Select the right options

From window style to performance glass to hardware finishes, your consultant will walk you through all the design options.

Understand replacement costs

Your consultant will help you price out your replacement and understand how to budget for your project.

Take measurements

Your project manager will visit your home to measure openings, accounting for variances. We use the measurements to place your order and custom-build your new windows and doors for a proper fit.

Plan an installation timeline

When placing your order, your consultant will give you a detailed timing estimate. We will be in touch with you over the weeks your order is being custom built, keeping you posted on progress and confirming installation dates.

Window Installation

New Hampshire window replacement installation day

Walk-through

Your project manager will conduct an initial walk-through on installation day and introduce you to your Infinity Replacement installers.

Remove old windows or doors

Our installers will carefully remove your old windows and doors before preparing the opening for new windows and doors.

Installation

Installers fit windows and doors securely. They’ll use flashing and caulk to prevent air and water leaks.

Final walk-through

Your project manager will conduct a final walk-through. We’ll explain how to operate your windows or doors and answer your questions.

Exterior view of a white brick home at dusk with the interior illuminated featuring white Infinity windows.

Ultrex® Fiberglass

Strength and look of fiberglass replacement windows

8x

Ultrex is 8x stronger than vinyl

Millions of fiberglass strands lend strength to your windows for slimmer profiles and broader views.

3x

Acrylic finish is 3x thicker compared to the competition

Infinity's proprietary finish provides a cleaner, smoother look that resists fading — even with the darkest colors.

Strength

Infinity's Ultrex fiberglass windows and patio doors deliver lasting performance

5k less conductive

Ultrex fiberglass is 5,000x less conductive than aluminum

Materials like fiberglass help insulate your home, retaining more heat in the winter and helping you stay cooler in the summer.

Outlasts 48K
UV hours

Smooth, lasting finish

Low-maintenance acrylic finish is 3x thicker than all other options, creating a polished look that resists scratching, denting, and fading, even after 48,000 hours of sunlight.

87% less expansion

Maintains leak-proof fit

Expanding less than both vinyl and Fibrex®, Ultrex frames stay tight and true to your glass panes, maintaining an energy-efficient seal year after year.

Fibrex is a registered trademark of Andersen Corporation.

Infinity Replacement - New Hampshire reviews

We've installed windows and doors across New Hampshire from Nashua to Derry, earning a nearly perfect Google rating.

Frequently asked questions

The best windows for cold weather, like New Hampshire feature a higher Solar Heat Gain Coefficient (SHGC) number and a lower U-factor number. Windows in New Hampshire that meet ENERGY STAR® certification criteria for the Northern climate zone in the ENERGY STAR Climate Zone Map will have U-factors of 0.26 or less. The windows will also have a SHGC number of 0.40 or more.

The best window material for cold climates is one that doesn’t allow heat to pass through easily. Some window materials allow heat to pass through easier than others. Infinity's Ultrex fiberglass windows are 5,000x less conductive than rolled-form aluminum.

Infinity Replacement windows rank among the best replacement window brands, according to U.S. News and World Report’s 360 Reviews. We craft custom windows for New Hampshire homes whether you need custom-made window inserts or full-frame window replacement. Our design consultants can help guide you through the window replacement process to find the best windows for New Hampshire weather by exploring energy efficient window options, window costs, and window styles.

Amherst, Antrim, Atkinson, Barnstead, Barrington, Bedford, Bennington, Bow, Bradford, Candia, Canterbury, Center Barnstead, Chester, Chichester, Contoocook, Danville, Deerfield, Derry, Dublin, Dunbarton, Durham, East Hampstead, East Kingston, Epping, Epsom, Exeter, Farmington, Fitzwilliam, Francestown, Fremont, Gilmanton, Gilmanton Ironworks, Gilsum, Goffstown, Greenfield, Greenland, Greenville, Hampstead, Hampton, Hampton Falls, Hancock, Harrisville, Henniker, Hillsborough, Hollis, Hooksett, Jaffrey, Keene, Lee, Lempster, Litchfield, Londonderry, Loudon, Lyndeborough, Marlow, Mason, Merrimack, Mont Vernon, Nashua, Nelson, New Boston, New Castle, New Ipswich, Newfields, Newmarket, North Hampton, North Sutton, Northwood, Nottingham, Pelham, Peterborough, Pittsfield, Plaistow, Portsmouth, Raymond, Rindge, Rollinsford, Rye, Rye Beach, Sandown, Seabrook, Somersworth, South Sutton, Spofford, Stoddard, Strafford, Stratham, Sullivan, Suncook, Swanzey, Temple, Tilton, Troy, Warner, Washington, Weare, Wilton, and Windham.

MA HIC 207086

An Infinity Replacement design consultant can work with you to help you find energy efficient windows and doors for your home. Infinity's Ultrex fiberglass windows and doors combined with glazing options can reduce energy costs.1 Ultrex fiberglass resists leaks and seal failures better than other window materials, plus has more strength than other window materials to stand up against bending and flexing.

1Savings reflects installing ENERGY STAR® certified products compared to non-certified when replacing single pane windows based on the average savings among homes in modeled cities. Actual savings will vary by product type, location, method of installation, individual home characteristics, local climate and conditions, utility rates and other factors.

Have a question? We’re here to help.

With Infinity Replacement – New Hampshire, you’ll get a stress-free experience from consultation to installation. Your project starts with a complimentary, no-hassle appointment — schedule a consultation to get started today!

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