Affiliations & Certifications
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Certified Excellence in Installation
When it comes to protecting and enhancing your home, choosing the right installer is just as important as selecting the right windows, doors, siding, gutters, or roofing. That’s why Thermo-Seal is proud to hold industry-recognized certifications and licenses—clear proof of our commitment to quality, professionalism, and lasting performance on every project.
- WC License #18925-H07
- Yonkers License #4352
- NJ License #13vh03970200
- CT License #Hic616176
- Putnam County License #6733
- Nassau License #H0810530000
- Suffolk License #43947
- Southhampton License #L002290
- NYC DCA #13110460
- Rockland County License #H-11137-07-38
- Long Beach License #14340
GAF Master Elite
Master Elite® Certification is GAF’s factory certification program that provides ongoing training to roofing contractors. With only 2% of all roofing contractors qualifying as Master Elite®, customers know their roof will be completed professionally.
James Hardie Contractor Alliance Member
The James Hardie Contractor Alliance Program is designed to match homeowners with professional contractors from around the country, who are trained and available to help you meet your needs for siding repair and replacement. In an effort to provide the highest level of service, customer satisfaction surveys are initiated on every James Hardie project installed by a Preferred Contractor using GuildQuality—a 3rd party customer satisfaction surveying service.
Certainteed 5 Star Contractor
Master Elite® Certification is GAF’s factory certification program that provides ongoing training to roofing contractors. With only 2% of all roofing contractors qualifying as Master Elite®, customers know their roof will be completed professionally.
Andersen Premier Certified Contractor
Andersen Premier Certified Contractor are true craftsmen who are hand-picked by Andersen and receive product training and installation resources. Thermo-Seal’s expertise and experience allows us to capture the vision for your home and provide the right products for your project.
Angie’s List, Super Service Award Winner
For over two decades, Angie’s List has provided trusted reviews to help millions of consumers make informed and confident hiring decisions when it comes to local service providers. Every year, Angie’s List awards the top rated companies in their respective industries with the prestigious Super Service Award. Thermo-Seal is proud to be a recipient of the Angie’s List Super Service Award.
Better Business Bureau (BBB)
BBB maintains Business Reviews on more than 4.5 million businesses and rates them based on complaint histories, responsiveness to customers, licensing, legal and government action, and other factors. Only Accredited Businesses that meet the BBB Code of Business Practices are permitted to display the BBB logo in their marketing and place of business.
EPA Certified
EPA’s Lead Renovation, Repair and Painting Rule (RRP Rule) requires that firms performing renovation, repair, and painting projects that disturb lead-based paint in homes, child care facilities and pre-schools built before 1978 have their firm certified by EPA (or an EPA authorized state), use certified renovators who are trained by EPA-approved training providers and follow lead-safe work practices.
Vinyl Siding Institute Certified (VSI)
The Vinyl Siding Institute, Inc. (VSI) is the trade association for manufacturers of vinyl and other polymeric siding and suppliers to the industry. Becoming VSI Certified provides a strong understanding of vinyl siding installation and industry recognized installation standards.
Frequently Asked Questions
Enhance your home’s security and curb appeal with Thermo-Seal’s expertly crafted entry doors. Wondering if it’s time for an upgrade? Explore our Entry Door Replacement FAQ for comprehensive insights into signs, suitable options, and the energy-efficient benefits of our replacements.
Can Thermo-Seal help with siding replacement?
Absolutely. We specialize in vinyl and insulated siding that boosts home value, improves energy efficiency, and provides long-lasting protection against Long Island’s weather.
Is financing available for home improvement projects?
Yes, Thermo-Seal offers flexible financing options to fit your budget, subject to credit approval. Ask about current promotions and low monthly payment plans.
How can I get a free estimate?
You can request a free, no-obligation estimate by calling us directly or filling out our quick online form. A Thermo-Seal specialist will contact you to schedule a convenient time.
What types of doors does Thermo-Seal install?
We install entry doors, patio doors, sliding glass doors, French doors, and storm doors from top-rated manufacturers. All doors are designed for durability, security, and curb appeal
Why Homeowners Choose Thermo-Seal
- Over 35 years of installation expertise
- ENERGY STAR® rated materials
- Custom sizing and finishes
- Professional, mess-free installation
- Trusted across Suffolk & Nassau Counties
What Our Clients Are Saying
We strive to make the entire home remodeling experience positive for our customers—from your first phone call, until the final handshake.
“I had a very good experience with Thermo-Seal. Chose them after interviewing many others because they’re local, communicated efficiently, and offered good midrange pricing and lifetime warranty. The crew did a fantastic job with the installation. They came early and finished 5 windows in 5 hours, and then they cleaned up. Highly recommended!”
Patrick B.
“We just completed a window and siding job for our home with Thermo-Seal. We are very impressed and satisfied with the quality of their products as well as the installation. I would recommend this company & I would use them again in the future if needed.”
Mindy L.
“The crew was 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! I will work with Thermo-Seal again for a front door replacement when the time comes.”
Bonnie K.
“We hired Thermo-Seal for new windows and siding and I could not be happier! 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. The project completed ahead of schedule and we were kept in the loop the entire time. Very happy with their work and highly recommended!”
Sarah C.
“We were referred to Thermo-Seal by a neighbor who was very pleased with the results. We replaced seven windows and a sliding patio door are thrilled with the results and how much they enhance the appearance of our home. Without hesitation, we recommend Thermo-Seal for your home improvement projects.”
Frank D.
“Cannot believe how stress-free an experience it was dealing with Aaron and his team. Aaron was very patient with our multiple questions and never any sales pressure. The installation was clean, quiet and the installation team friendly and helpful. The windows were installed a few weeks before they were promised and there were no surprises. We will be strongly recommending Thermo-Seal to friends looking for replacement windows.”
David B.
