"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
Thermo-Seal has been providing high quality window replacement services to customers throughout the Tri-State area since 1985. The excellent craftsmanship and value of our windows are hard to beat. We’ll help you select the windows that are the right fit for your home, and then install them professionally for the peace of mind and energy savings you deserve.
Approach
At Thermo-Seal, we believe in a straightforward approach: integrating energy-efficient windows, top-tier materials, and skilled installation to provide enduring comfort, aesthetic appeal, and exceptional performance for every homeowner we assist.
Mission
Our mission is to deliver homeowners premium, energy-efficient windows that elevate curb appeal, enhance comfort, lower energy expenses, and guarantee enduring value supported by reliable craftsmanship.
Vision
We imagine homes throughout the Tri-State area featuring robust, elegant, and eco-friendly windows—enhancing living environments while establishing a benchmark for excellence in exterior remodeling solutions.
• Window Styles •
Energy-Efficient Windows for Homes in the Tri-State Area
Windows from Thermo-Seal can be designed to fit virtually any opening and are available in vinyl, wood, or composite. Choose from our most popular window styles, or let us know if you're looking for something custom.
Bay and Bow Windows
Beautifully designed & energy efficient, these windows are the perfect addition to any living room.
Casement Windows
Achieve maximum ventilation & clear views with the simple turn of a handle.
Double Hung Windows
These classic windows look great in any home, offering upper and lower sashes they are one of our most versatile models.
Garden Windows
A garden window is perfect for any kitchen & a perfect way to keep plants healthy.
Picture Windows
These windows fill any room with sunlight & offer unobstructed views of the beautiful outdoors.
Sliding Windows
Allow plenty of natural light in with these easy to open contemporary windows.
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
services we provide
Professional Exterior Remodeling Services
Windows
Enhance your home with energy-efficient windows from Andersen, Pella, and Harvey. Our expert installations improve comfort, reduce energy costs, and add timeless beauty to your living spaces.
Siding
Protect and beautify your home with durable siding solutions. We install fiber cement, vinyl, and wood siding for lasting performance, improved curb appeal, and energy efficiency.
Roofing
Safeguard your home with premium roofing systems. From GAF asphalt shingles to metal and tile roofing, our certified experts deliver strength, durability, and long-term weather protection.
Doors
Upgrade your entryways with stylish, secure doors from Therma-Tru and other leading brands. Our installations enhance curb appeal, improve security, and provide lasting performance for your home.
Gutters
Keep your home protected with seamless gutter systems designed to prevent water damage. Our expert installations ensure durability, efficiency, and reliable protection for your roof and foundation.
Certified. Trusted. Proven.
With Thermo-Seal, you receive expert craftsmanship and trusted credentials. We partner with top manufacturers and hold certifications to provide the best products. As a licensed and insured company, we safeguard your investment.
Our Edge.
Why Choose Thermo-Seal for Your Windows?
Rely on Thermo-Seal to provide a window that’s maintenance free, durable, airtight, and energy efficient. Contact us today for a custom window plan that will bring comfort, beauty, and satisfaction to your family year after year.
Professional Installation
When you hire us for your replacement windows you will be working with a professionally trained and well experienced company. Our installers are fully trained and insured.
Customer Care
Client satisfaction is our top priority. We ensure high-quality, accurate work. You'll never be disappointed! We are highly rated on home improvement review sites and appreciate all the positive feedback!
Andersen Certified Contractor
We have been vetted, trained, and backed by Andersen Windows & Doors, the industry's #1 most trusted and recommended brand of window and doors.
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.
