Expert Window Installation & Replacement in Long Island
Window Installation in Long Island
40 Years of Experience
Certified Professionals
Superior Workmanship with Proven Reputation
Stress-Free Process
Thermo-Seal Windows, Siding & Roofing, Inc.
Expert Window Installation Near You in Long Island — Trusted by Homeowners Since 1985
When Long Island homeowners search for window installation near me, they consistently turn to Thermo-Seal for top-rated service and over 40 years of experience. Since 1985, we’ve provided professional window installation that enhances home efficiency, comfort, and curb appeal—using trusted products from brands like Andersen, Pella, and Harvey.
All work is completed by our certified in-house team—no subcontractors—so you get quality craftsmanship every step of the way. From initial consultation to final inspection, Thermo-Seal makes window installation in Long Island homes straightforward and worry-free.
From Nassau’s coastal neighborhoods to Suffolk’s country estates, Long Island homes benefit from custom-fit window solutions—and Thermo-Seal delivers them with precision and care.
Thermo-Seal window Installation in Long Island
Professional Window Installation in Long Island That Transforms Your Home
Installing new windows does more than update your home’s appearance—it improves insulation, reduces outside noise, and cuts down on energy costs. At Thermo-Seal, we bring decades of hands-on experience to every window installation in Long Island, using only premium materials to ensure long-term performance.
Our services cover all major window types, including:
✔ Double-hung and casement windows for airflow and classic style
✔ Bay and bow windows that open up rooms and increase natural light
✔ Sliding and picture windows for sleek, modern views
✔ Custom-designed windows for unique architecture or older homes
Each Long Island window installation is done with precision and care—ensuring a tight seal, proper fit, and excellent energy efficiency.
Why Homeowners Choose Thermo-Seal for Window Installation in Long Island
Thermo-Seal has become a trusted name for window installation in Long Island and throughout the Tri-State Area. With over 40 years of experience, our reputation is built on craftsmanship, customer care, and premium-quality products.
Why Long Island homeowners choose Thermo-Seal:
✔ Certified Experts
We’re Andersen Certified Contractors and part of America’s Home Remodeling Group—bringing proven expertise to every project.
✔ Industry-Leading Products
We use high-performance windows from Andersen, Pella, and Harvey for lasting results.
✔ In-House Team, Every Time
We never outsource—our own trained installers manage every Long Island window installation with precision.
✔ Highly Rated Reputation
With an A+ rating from the BBB and Angi Super Service Award, we’re known for delivering excellence in both product and service.
What’s Included in Our Window Installation Service in Long Island
Thermo-Seal provides a complete solution for window installation in Long Island—from consultation to installation and everything in between.
Here’s what you can expect:
✔ Free In-Home Consultation: We measure your windows, explore style options, and offer a no-pressure estimate.
✔ Product Selection: Choose energy-efficient designs that match your home's needs and aesthetics.
✔ Expert Installation: Our team installs windows according to strict manufacturer standards.
✔ Thorough Clean-Up & Final Inspection: We treat your home with care and ensure every window is fully operational.
✔ Warranty Protection: You’ll receive strong product warranties and Thermo-Seal’s satisfaction guarantee.
How Long Does a Window Installation Take in Long Island?
Most window installation projects in Long Island are completed in one day, depending on the number and type of windows. Our skilled team works efficiently and cleanly—delivering flawless results with minimal disruption to your household.
How Much Does Window Installation Cost in Long Island?
The cost of window installation in Long Island varies by window style, size, and quantity. Thermo-Seal provides free in-home estimates and upfront pricing—so you’re never caught off guard.
We’ll help you select windows that fit your home and budget. With 0% interest financing available, getting your Long Island windows upgraded has never been easier.
The Benefits of Professional Window Installation in Long Island
Proper window installation in Long Island protects your home, improves comfort, and boosts efficiency. Poor installation can lead to water damage, air leaks, and high utility bills—but Thermo-Seal ensures it’s done right the first time.
✔ Save on energy costs with airtight, insulated windows
✔ Maintain indoor comfort by preventing unwanted drafts
✔ Refresh your home’s look with professionally installed styles
✔ Increase your property value with modern, efficient upgrades
✔ Block outside air, moisture, and noise from entering your home
Trust Thermo-Seal for expert window installation in Long Island—you’ll feel the difference immediately.
Frequently Asked Questions About Window Installation in Long Island
1. Do I need to replace all my windows at once?
Not necessarily. While many homeowners choose to install all new windows for consistent performance and aesthetics, Thermo-Seal can complete window installation in phases that fit your budget and timeline.
2. Are new windows really more energy-efficient?
Yes. Modern windows use advanced glass coatings, insulated frames, and precision sealing to reduce energy loss. A professional window installation ensures these benefits are fully realized, saving you money year-round.
3. Can I install windows myself?
DIY installation can lead to air leaks, moisture damage, and voided warranties. Professional window installation by Thermo-Seal ensures manufacturer compliance, long-term durability, and a perfect fit.
4. How do I prepare my home for installation day?
Clear access to windows by moving furniture, curtains, or blinds. Our team handles the rest—protecting floors, removing old windows, and completing your new window installation with care and efficiency.
5. What makes Thermo-Seal different from other window installers?
Thermo-Seal has been performing window installation near me since 1985 with certified in-house professionals, top-quality materials, and award-winning service. Our legacy of trust, craftsmanship, and accountability sets us apart from typical contractors.
Schedule Your Free Window Installation Estimate Today
When it comes to window installation near me, no one matches Thermo-Seal’s proven experience, product quality, and customer satisfaction. Since 1985, we’ve helped thousands of homeowners replace and install windows that look beautiful and perform flawlessly for decades.
Contact us today to schedule your free in-home estimate and see why Thermo-Seal is the Tri-State’s trusted name in window installation.
📞 Call (866) 901-6808 or visit one of our offices in Rockville Centre, Rye, Stamford, or Melville to get started.
- 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
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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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