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Serving the Tri-State Area with Reliable Home Remodeling Solutions Since 1985

Thermo-Seal stands as the Tri-State Area’s top choice for exterior remodeling, delivering exceptional value on windows, siding, roofing, doors, and gutters. Request your no-obligation estimate today.

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Certified Professionals

Our team holds top-tier industry credentials, including GAF Master Elite® and Andersen Certified Contractor distinctions.

Recognized for Excellence

With an A+ rating from the BBB and multiple Angi Super Service Awards, our commitment to quality is well proven.

Preferred by Homeowners

Thermo-Seal is the go-to choice for thousands of homeowners who trust us for reliable, expert exterior remodeling.

————  ABOUT US

Leading Window, Siding & Roofing Contractor in the Tri-State Area

For over four decades, Thermo-Seal has been the trusted name in exterior home remodeling across the Tri-State region. Our expertise covers premium windows, siding, roofing, doors, and gutters—installed with precision and backed by products from the most respected brands in the industry.


What sets us apart? We never outsource our work. Every project is completed by our dedicated, in-house professionals to maintain the highest level of workmanship. With certifications like Andersen Premier Certified Contractor, GAF Master Elite® Contractor, and James Hardie ALLIANCE member status, we deliver unmatched quality and peace of mind with every installation.

40 Years of Experience

Full-Time, In-House Professionals

Top Certifications

Premium Materials

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America’s Home Remodeling Group

Discover Our Full Range of Exterior Remodeling Solutions

Windows

Enhance your home with top-quality Andersen windows, available in advanced materials like Fibrex®, wood, vinyl, and fiberglass. We also carry premium window options from trusted brands like Pella and Harvey—all supported by a limited lifetime warranty. Professionally installed for maximum performance, our energy-efficient windows boost curb appeal, improve thermal efficiency, and offer long-term durability backed by expert workmanship.

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Siding

Give your home a lasting upgrade with James Hardie fiber cement siding—renowned for its strength, weather resistance, and beautiful finish. We also install high-quality vinyl siding from CertainTeed and Westlake Royal Building Products, along with classic cedar shake siding that brings natural charm and texture. Offered in a variety of styles, our siding solutions combine long-term protection, low maintenance, and enduring curb appeal.

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Roofing

Shield your home with top-tier roofing options, including GAF asphalt shingles, as well as durable tile, metal, and copper roofing systems. As a certified GAF Master Elite® Contractor, we deliver expert-level installation and lasting performance. With premium materials and skilled craftsmanship, our roofs provide exceptional protection, enhanced energy efficiency, and timeless curb appeal—built to endure even the harshest weather conditions.

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Doors

We offer professional installation of high-performance doors from trusted names like Therma-Tru, Andersen, Pella, and Harvey. Whether you’re looking for entry doors, sliding glass doors, French doors, or storm doors, we have a wide selection in wood, vinyl, fiberglass, and steel. Each option is designed to boost security, insulation, and aesthetic appeal. Our precise installations help improve energy efficiency while enhancing the overall look and usability of your home’s exterior and interior transitions.

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Gutters

Protect your home’s foundation with seamless gutter systems and cutting-edge gutter guards designed for maximum efficiency. Our high-performance gutter solutions effectively channel rainwater away from your property, helping to prevent costly erosion and water damage. Built for durability and minimal upkeep, these systems offer long-term protection while significantly reducing the need for frequent cleanings.

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Certified. Trusted. Proven.

Choosing Thermo-Seal means getting expert workmanship supported by proven credentials. We've teamed up with the industry's most respected manufacturers and earned their highest certifications to provide you with top-tier products. Fully licensed and insured, we make sure your home—and your investment—is protected from start to finish.

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Affiliations & Certifications:

Browse Our Latest Projects

Explore our newest projects to witness how Thermo-Seal elevates homes through professional window, siding, and roofing installations. Discover authentic results that highlight our skilled craftsmanship, premium materials, and enduring value.

——•  Testimonials

What Our Customers Says

We aim to ensure that every aspect of the home remodeling journey is a pleasant one for our customers—from that initial phone call to the final handshake.

If I could give Aaron, Bob and his crew more than 5 stars, I absolutely would. Everyone was incredibly professional, punctual, conscientious and a delight to have on the project. I work in the construction field as an attorney and I have heard horror stories. This was a smooth experience and the finish on the house is really top notch. Bob and his team don’t just finish a job, they make sure it’s aesthetically pleasing and met my impossible standards. I have an eagle eye for details and their work exceeded expectations. We had every window replaced and put on James Hardie siding. They even repaired part of our roof. I never write reviews because I’m usually very underwhelmed, but I had to take the time for this review. If you are on the fence with contractors, look no further. It is a no-brainer to retain Thermo-Seal. (As a side note, my very young kids know Bob by name - which should indicate that he’s a fantastic part of the Project that is always showing up!)

Stephanie T.

From FACEBOOK

We hired Thermo-Seal for new windows and siding and I could not be happier!!! Aaron and Bob have been a pleasure to work with- their team is on time, professional, and meticulous about their work. You can tell they take pride in their output and ensure things are done correctly the first time around. Pricing is competitive and even when we ran into a slight snag (as you typically would expect from a 100+ year old home), both Aaron and Bob were very fair. The Project completed ahead of schedule and Bob kept us in the loop the entire time. Very happy with their work and highly recommended!!!

Sarah C.

From GOOGLE

We talked to a few Companies that sold James Hardee siding but Aaron sold us with his knowledge and confidence. He was not wrong he delivered everything he promised. We had some issues with our house. They explained them communicated and we were never pressured. Our house and roof look amazing. They even replaced an old skylight. The staff were all incredible, proud of their work, professional, friendly and they cleaned up each night. Bob the General contractor was also amazing. Always picked up the phone, checking in on the project and with us. It has been a long time since I worked with such a competent company. It's rare these days, which is why I was willing to write this review. I would give them 10 stars!!

Joan M.

From YELP

We shopped around and discovered Aaron and his team through a FB group. We really appreciated that Aaron was able to measure and order our windows quickly and received all 21 of our windows in 8 weeks. Other vendors were quoting us 24-26 weeks! Installation was seamless and the quality of the Harvey windows is top notch. I felt like the price was extremely reasonable, if not less than competitors. The installers were courteous, experienced and real pros. Aaron was always available for a phone call or via text. Everyone on his team is a great communicator. We appreciated the whole experience from start to finish. You won't be disappointed!

Stephanie N.

From GOOGLE

Thermo-Seal was scheduled to side our house when in one of the many storms this spring, our roof got damaged. We hired Thermo-Seal to do both jobs and could not be more pleased. The crew was efficient and neat on both jobs. The general manager Bob was on site to answer any questions or concerns that we had. They also took care of all of the paperwork for our insurance company for the roof and that was a blessing. We would highly recommend Thermo-Seal to anyone who needs work done. The owner Aaron is very proud of his company and it shows in the work that the company does and the pride that his workers take. Love them!!!!!!

Roberta McHugh C.

From FACEBOOK

What a GREAT company windows are beautiful and the workers did an absolute perfect job, clean, neat, and finished off beautifully. They even touched up with my paint and seemed to enjoy going the extra mile to please...Aaron is an great guy who loves what he does and is proud of the company and his family of workers. I would recommend Thermoseal windows and siding to anyone who wants quality work at great prices.

Bill W.

From FACEBOOK

Aaron and his crew were a pleasure to work with and we love our new windows. The installation was efficient and the team was very professional. I’ve seen a difference in my heating bill since the install, which was our primary goal so we are very happy so far! Aaron even had a custom design made for us that matches the antique original windows of our 100+ year-old house. I will work with Aaron and Thermo-Seal again on a front door replacement when the time comes.

Michael T.

From GOOGLE

Aaron was always very responsive and on top of hus game. We are very pleased with the final result and would highly recommend him and his crew.

Rami A.

From YELP

I'm so happy with my new windows! My only regret is that I don't have more windows to replace! Aaron and his team were a dream to work with - communicative, friendly, and direct. They worked with me to scope out exactly what I wanted and they were very transparent and fair on price. The installation team was efficient and respectful, making sure everything was done to the utmost standards. My windows look amazing but more importantly they work fantastically! I was shocked at how much quieter and cooler my house was after the new windows were installed, and they are so much easier to keep clean. I will be recommending Thermo-Seal to everyone!!

Carly W.

From YELP

Where can we begin with Aaron and his team? What drew us to him initially was his responsiveness in our hour of need - as water poured into our bedroom through cheap, poorly installed windows. Aaron talked me through immediate solutions even before it was clear we would hire his company. Once they got in to see, he guided us through every step of the process to fix the problem and replace two of our windows. We appreciated that he called to check in frequently when his team was on-site, and that he is responsive over text. His team is also highly capable, friendly, and trustworthy. We look forward to doing more business with Thermo-Seal in the near future!

Megan W.

From YELP

OUR DIFFERENCE

Why Choose Thermo-Seal?

For more than four decades, Thermo-Seal has been the trusted name in exterior remodeling for homeowners seeking lasting quality. Our dedication to expert craftsmanship, premium materials, and exceptional customer care sets us apart. Backed by a strong reputation, skilled in-house crews, and some of the best warranties in the industry, we complete every project with precision, attention to detail, and long-term value in mind.

Free, No-Hassle Estimates

We prioritize transparency and convenience. Our complimentary, no-obligation estimates provide you with a clear overview of your project’s scope and costs—no pressure, no hidden charges, just genuine guidance.

Decades of Experience

Since 1985, we have been enhancing homes throughout the Tri-State area. With over 40 years of experience, we deliver exceptional remodeling solutions supported by a reliable reputation.

In-House Installers

Unlike many contractors, we do not employ subcontractors. Our dedicated team of full-time installers guarantees consistent craftsmanship, exceptional quality, and complete accountability, providing outstanding results every time.

100% Satisfaction Guarantee

Your satisfaction is our top priority. We support every project with a 100% Customer Satisfaction Guarantee, ensuring you receive exceptional service and results that go beyond your expectations.

Schedule Your Free In-Home Estimate

THERMO HOME PPC

• Areas We Service •

Areas We Service in New York & Connecticut

Thermo-Seal takes pride in serving New York and Connecticut. Our reach extends from Nassau County, Suffolk County, Rockland, and Westchester to Fairfield County and the greater regions of Connecticut. Our experts are present in numerous local communities, delivering the highest quality of service in the industry, bolstered by over four decades of experience and a reputation you can rely on.

  • Nassau County
  • Huntington
  • Huntington Station
  • Dix Hills
  • Commack
  • Northport
  • East Northport
  • Smithtown
  • Kings Park
  • St. James
  • Nesconset
  • Hauppauge
  • Brentwood
  • Central Islip
  • Islip
  • East Islip
  • West Islip
  • Bay Shore
  • Deer Park
  • Babylon
  • West Babylon
  • Lindenhurst
  • Copiague
  • Amityville
  • Patchogue
  • Medford
  • Holbrook
  • Ronkonkoma
  • Lake Ronkonkoma
  • Selden
  • Centereach
  • Coram
  • Farmingville
  • Port Jefferson
  • Port Jefferson Station
  • Mount Sinai
  • Miller Place
  • Rocky Point
  • Shoreham
  • Riverhead
  • Hampton Bays
  • Suffolk County
  • Huntington
  • Huntington Station
  • Dix Hills
  • Commack
  • Northport
  • East Northport
  • Smithtown
  • Kings Park
  • St. James
  • Nesconset
  • Hauppauge
  • Brentwood
  • Central Islip
  • Islip
  • East Islip
  • West Islip
  • Bay Shore
  • Deer Park
  • Babylon
  • West Babylon
  • Lindenhurst
  • Copiague
  • Amityville
  • Patchogue
  • Medford
  • Holbrook
  • Ronkonkoma
  • Lake Ronkonkoma
  • Selden
  • Centereach
  • Coram
  • Farmingville
  • Port Jefferson
  • Port Jefferson Station
  • Mount Sinai
  • Miller Place
  • Rocky Point
  • Shoreham
  • Riverhead
  • Hampton Bays
CONTACT THERMO-SEAL TODAY