Expert Window Installation & Replacement
Window Replacement in Long Island
40 Years of Experience
Certified Professionals
Superior Workmanship with Proven Reputation
Stress-Free Process
Thermo-Seal Windows, Siding & Roofing, Inc.
Trusted Window Replacement in Long Island Since 1985
Looking for reliable window replacement on Long Island? Thermo-Seal has proudly served homeowners across the Tri-State Area for more than 40 years, providing high-quality windows and expert installation. We bring together trusted products, precise workmanship, and energy-efficient upgrades to improve your home’s beauty, comfort, and long-term performance.
If your Long Island home has windows that are outdated, leaking, or inefficient, we’ll replace them with durable, professionally installed solutions designed to last.
From homes along the South Shore to those in the North Shore’s historic communities, we proudly serve all of Long Island with window replacements tailored to the region’s distinct architecture and climate.
Thermo-Seal window replacement
Enhance Comfort, Efficiency & Curb Appeal With Professional Window Replacement in Long Island
Windows play a critical role in how your home looks and performs. At Thermo-Seal, our Long Island window replacement services address common homeowner problems—like aging window frames, poor insulation, and increasing energy bills. We install industry-leading products from Andersen, Pella, and Harvey—each known for lasting performance and visual appeal.
We offer a wide selection of replacement windows on Long Island, including:
✔ Composite Fibrex® windows that blend strength with easy upkeep
✔ A variety of wood, vinyl, and fiberglass styles for any home design
✔ Energy-saving glass packages that help lower utility costs
Every Long Island window installation is performed by our own in-house team, never subcontractors—ensuring expert care from beginning to end.
Why Homeowners Choose Thermo-Seal for Window Replacement in Long Island
Thermo-Seal has earned its reputation as a leading window replacement provider in the Tri-State Area for over four decades. On Long Island, our work stands out for its consistent quality, trusted brands, and experienced installation teams.
Here’s why Long Island homeowners choose Thermo-Seal:
✔ Certified Expertise
We’re Andersen Certified Contractors and members of America’s Home Remodeling Group, delivering reliable, high-level service.
✔ Premium Products
We work with Andersen, Pella, and Harvey—offering windows that balance performance, durability, and style.
✔ In-House Installers
Every job is completed by our trained staff—ensuring full accountability and precision throughout your Long Island project.
✔ Award-Winning Reputation
With an A+ rating from the BBB and multiple Angi awards, we’re known for delivering excellent service and consistent results.
From the first consultation to the final inspection, your Long Island home is in capable hands.
How Long Does Window Replacement in Long Island Take?
Most window replacement projects on Long Island are completed in a single day. Our experienced installers manage everything smoothly—from measuring to cleanup—so you can enjoy your upgraded windows with minimal disruption. We leave your Long Island home clean and ready to show off your new windows.
What Are the Benefits of Window Replacement in Long Island?
Replacing windows on Long Island delivers lasting improvements in comfort, savings, and style:
✔ Reduced Energy Costs: Modern windows reduce air leakage, saving on heating and cooling.
✔ Improved Home Comfort: Eliminate drafts and maintain consistent temperatures.
✔ Upgraded Appearance: Fresh window styles enhance your home’s look and value.
✔ Noise Reduction: New glass options help block outside sounds.
✔ Easier Maintenance: Today’s windows are built for durability and low-maintenance care.
Thermo-Seal ensures your Long Island window replacement adds real value right from day one.
How Much Does Window Replacement in Long Island Cost?
The cost of window replacement on Long Island varies based on your window size, design, and material preferences. That’s why Thermo-Seal offers free, no-pressure in-home estimates with clear, honest pricing. We’ll walk you through your options and deliver a detailed quote that fits your needs and budget.
We also offer 0% interest financing—making it easy for Long Island homeowners to invest in high-quality replacement windows without financial strain.
Schedule Your Free Window Replacement Estimate in Long Island Today
Ready to experience the difference of expertly installed, energy-efficient windows? Thermo-Seal has been the Tri-State’s trusted choice for window replacement near me since 1985. Our certified team delivers the perfect combination of quality, performance, and style—backed by decades of proven results.
Schedule your free, no-hassle in-home estimate today and see why thousands of homeowners trust Thermo-Seal for their window replacement needs.
📞 Call (866) 901-6808 or visit one of our convenient offices in Rockville Centre, Rye, Stamford, or Melville.
- Rockville Centre
- Huntington
- Melville
- Farmingdale
- Plainview
- Syosset
- Roslyn
- Manhasset
- Oyster Bay
- Hauppauge
- Smithtown
- Garden City
- Massapequa
- Westbury
- Nassau County
- Suffolk County
- Long Island
- New York City
- Westchester
- Rye
- Scarsdale
- Larchmont
- Mamaroneck
- Yonkers
- White Plains
- New Rochelle
- Bronxville
- Pelham
- Harrison
- Queens
- The Bronx
- Fairfield County
- Stamford
- Greenwich
- Darien
- Westport
Frequently Asked Questions About Window Replacement in Long Island
1. How do I know when it’s time to replace my windows?
If you notice drafts, condensation between glass panes, difficulty opening or closing, or higher energy bills, it’s likely time for window replacement. Modern windows not only improve efficiency but also enhance comfort, safety, and resale value.
2. Can I replace my windows year-round?
Yes. Thermo-Seal performs window replacement in all seasons using industry best practices to minimize energy loss during installation. Our installers work quickly and cleanly, ensuring your home stays comfortable throughout the process.
3. Are replacement windows energy-efficient?
Absolutely. We install ENERGY STAR® certified windows from Andersen, Pella, and Harvey, designed to reduce heat transfer and lower energy costs. Many homeowners see noticeable savings after a professional window replacement.
4. What window materials last the longest?
Composite Fibrex® and fiberglass windows are among the most durable, combining strength, low maintenance, and excellent insulation. Vinyl windows also offer long-lasting value with minimal upkeep, making them popular choices for window replacement.
5. Why should I choose Thermo-Seal over other contractors?
Thermo-Seal has been delivering expert window replacement near me for more than 40 years. With in-house installers, premium materials, and award-winning service, we guarantee results that stand the test of time. Our reputation is built on trust, craftsmanship, and customer satisfaction—every window, every home.
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Services We Offer:
Upgrade Your Home Now & Pay Later – Interest Free!
For a limited time, enjoy convenient financing with 0% interest for up to 25 months.
Contact Info.
Phone Number:
Email Address:
Showroom:
456 Sunrise Highway, Rockville Center NY 11570 - (516) 689-7214
Rye Corporate Office:
411 Theodore Fremd Avenue, Rye NY 10580 - (914) 635-3748
Stamford Office:
263 Tresser Blvd., Stamford, CT 06901 - (203) 990-1812
Melville Office:
68 South Service Road., Melville NY 11747 - (631) 710-6937
CLIENT REVIEWS
What Our Clients Are Saying About Us
Thermo-seal Windows provides exceptional customer service alongside high-quality products. Recently, I had the majority of my home's windows replaced by Aaron's team, and their performance was nothing short of impressive. They arrived on time, maintained a tidy work area, and dedicated themselves to ensuring a perfect installation of the windows.
Aaron and his team were amazing, from start to finish! They worked with us every step of the way and Aaron was always just a call or text away to answer any questions we had. The windows are perfect and we love them. We highly recommend working with Aaron and his team. They are professional, courteous and their work is top notch!
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