"At Thermo-Seal, we believe every home deserves windows that are energy-efficient, stylish, and built to last. Our expert installations combine premium brands with superior craftsmanship—delivering comfort, beauty, and long-term value."
Thermo-Seal Windows, Siding & Roofing, Inc.
Top-Rated Window Company Proudly Serving Westchester, Rockland, Suffolk, Nassau & Fairfield Counties
Since 1985, Thermo-Seal has delivered top-tier window replacement services across the Tri-State area. Known for outstanding craftsmanship and unbeatable value, our team helps you choose the perfect windows for your home—and installs them with expert precision to give you lasting comfort, energy efficiency, and total peace of mind.
Approach
At Thermo-Seal, our approach is simple and effective—pairing energy-efficient windows with premium materials and expert installation to deliver lasting comfort, enhanced curb appeal, and reliable performance for every homeowner we serve.
Mission
Our mission is to provide homeowners with high-quality, energy-efficient windows that boost curb appeal, improve indoor comfort, reduce utility costs, and offer long-term value—all backed by trusted, expert craftsmanship.
Vision
We envision homes across the Tri-State region equipped with strong, stylish, and energy-efficient windows—creating more comfortable living spaces while setting the standard for quality in exterior remodeling.
• Window Styles •
Energy-Efficient Windows for Homes in the Tri-State Area
Thermo-Seal windows can be tailored to suit nearly any opening and are offered in vinyl, wood, and composite materials. Select from our most popular styles—or talk to us about custom options to match your specific vision.
Bay and Bow Windows
Combining elegant design with energy efficiency, these windows make an ideal upgrade for any living room.
Casement Windows
Enjoy wide-open views and optimal airflow with the easy turn of a handle.
Double Hung Windows
These timeless windows complement any home style and feature both upper and lower sashes, making them one of our most adaptable options.
Garden Windows
Garden windows are a charming addition to any kitchen and an ideal spot to keep your plants thriving.
Picture Windows
These windows flood your space with natural light and provide wide, uninterrupted views of the outdoors.
Sliding Windows
Let abundant natural light in with these sleek, modern windows that open effortlessly.
"At Thermo-Seal, we believe every home deserves windows that are energy-efficient, stylish, and built to last. Our expert installations combine premium brands with superior craftsmanship—delivering comfort, beauty, and long-term value."
Thermo-Seal Windows, Siding & Roofing, Inc.
A+ Rated Window Company Serving Westchester, Rockland, Suffolk, Nassau & Fairfield Counties
Since 1985, Thermo-Seal has proudly delivered top-quality window replacement services to homeowners across the Tri-State area. Our windows offer outstanding value and expert craftsmanship that truly stand out. We’ll guide you in choosing the ideal windows for your home and ensure a professional installation—giving you confidence, comfort, and long-term energy savings.
Approach
At Thermo-Seal, our approach is simple: we combine energy-efficient windows, premium-grade materials, and expert installation to deliver lasting comfort, visual appeal, and top-tier performance for every homeowner we work with.
Mission
Our mission is to provide homeowners with high-performance, energy-saving windows that enhance curb appeal, increase comfort, reduce energy costs, and offer long-lasting value—all backed by dependable, skilled workmanship.
Vision
We envision homes across the Tri-State area featuring strong, stylish, and environmentally friendly windows—elevating everyday living while setting a new standard for excellence in exterior remodeling.
Your Questions, Answered
Frequently Asked Questions
How do I know when it's time to replace my windows?
Signs that you may need window installation or replacement include drafts, rising energy bills, difficulty opening or closing windows, visible damage, or condensation between panes. If your windows are 15–20 years old or older, they may also lack modern energy-efficiency features. During your consultation, Thermo-Seal will assess your current windows and help you determine the best solution based on performance, appearance, and cost.
What types of windows does Thermo-Seal install?
We install a wide variety of energy-efficient window styles, including double hung, casement, sliding, bay, bow, garden, and picture windows. Each style is available in materials like vinyl, wood, or composite to suit your home’s architectural needs and personal preferences. Whether you’re looking for better airflow, larger views, or a custom look, we’ll help you choose the right window styles for your space.
How long does a typical window installation take?
Most standard window installation projects can be completed in a single day, especially if you're replacing multiple windows of standard sizes. However, the timeline can vary depending on the number of windows, type, and any custom specifications. Thermo-Seal’s experienced, in-house crews work efficiently and cleanly, ensuring your project is completed with minimal disruption.
Do new windows really improve energy efficiency?
Absolutely. Modern energy-efficient windows significantly reduce heat transfer, helping your home stay warmer in the winter and cooler in the summer. Thermo-Seal installs windows from leading brands that feature insulated frames, Low-E glass, and advanced weatherstripping to minimize energy loss. This can lower utility bills while improving indoor comfort year-round.
Does Thermo-Seal use subcontractors for window installations?
No. At Thermo-Seal, all window installation and replacement work is performed by our full-time, in-house professionals. This ensures consistent quality, accountability, and expert craftsmanship on every project. With over 40 years of experience and thousands of satisfied customers, we pride ourselves on doing the job right—the first time.
Schedule an Appointment
Contact us through our contact form and we’ll get back to you as soon as we can.
WINDOWS PPC
services we provide
Professional Exterior Remodeling Services
Windows
Upgrade your home with energy-efficient windows from trusted brands like Andersen, Pella, and Harvey. Our professional installations boost comfort, lower utility bills, and bring lasting elegance to your living spaces.
Siding
Safeguard and enhance your home with long-lasting siding options. We install fiber cement, vinyl, and wood siding that deliver reliable performance, boost curb appeal, and support better energy efficiency.
Roofing
Protect your home with high-quality roofing systems built for longevity. Whether you choose GAF asphalt shingles, metal, or tile roofing, our certified specialists ensure lasting strength, durability, and dependable weather resistance.
Doors
Transform your entryways with secure, beautifully crafted doors from Therma-Tru and other top brands. Our expert installations enhance your home’s appearance, boost security, and ensure long-term, reliable performance.
Gutters
Defend your home against water damage with seamless gutter systems engineered for effective drainage. Our professional installations provide long-lasting durability, optimal efficiency, and dependable protection for both your roof and foundation.
Certified. Trusted. Proven.
At Thermo-Seal, you benefit from skilled craftsmanship backed by industry-recognized credentials. We work with leading manufacturers and maintain top certifications to offer only the highest quality products. As a fully licensed and insured contractor, we protect your home and your investment every step of the way.
Our Edge.
Why Choose Thermo-Seal for Your Windows?
Count on Thermo-Seal to deliver windows that are low-maintenance, long-lasting, energy-efficient, and tightly sealed. Get in touch with us today to create a custom window plan that adds comfort, style, and lasting value to your home for years to come.
Professional Installation
When you choose us for your window replacement, you’re partnering with a highly experienced, professionally trained team. Our installers are fully insured and qualified to ensure your project is completed with care and expertise.
Customer Care
Your satisfaction is our number one goal. We take pride in delivering precise, high-quality workmanship you can count on. With strong ratings across home improvement review platforms, we’re grateful for the positive feedback and continued trust from our customers.
Andersen Certified Contractor
We’ve been thoroughly vetted, professionally trained, and proudly endorsed by Andersen Windows & Doors—the most trusted and recommended name in the window and door industry.
Experience the Thermo-Seal Difference
Reliable Exterior Remodeling in the Tri-State Area
Real Stories, Real Feedback
Our Client Reviews
Aaron and his team were fantastic! Our windows were ready 2 weeks earlier than expected and his team was always on time. They were pleasant to have around, were respectful of our space and cleaned up after themselves. We had a problem with rot in one of our walls and Aaron and his team helped us to fix it as part of the window installation, including finding a great electrician at the last minute. Thanks, Thermo-Seal! We're very pleased.
Rachel R.
I had a very good experience with Thermo Seal. Chose them after interviewing many others bc they're local, communicated efficiently and offered good midrange pricing + lifetime warranty. Aaron was great to work on setting up the contract and and then Fabio and his crew did a fantastic job with the installation. They came early, they finished 5 windows in 4-5 hours, they cleaned up. Fabio even helped me take care of another issue he found on the roof. Highly recommended.
Patryk B.
