Thermo-Seal Windows, Siding And Roofing

Looking for expert home exterior services in Nassau & Suffolk County? Thermo-Seal is Long Island’s trusted choice for high-performance windows, siding, and roofing. Proudly serving Smithtown, Huntington, Commack, and beyond, we bring over 30 years of experience to every project. Our team is known for energy-efficient installations, exceptional craftsmanship, and reliable customer service.

Whether you're upgrading curb appeal or cutting energy costs, Thermo-Seal delivers quality that lasts. We use top-rated materials that meet today’s performance standards—backed by local testimonials and long-term value.

Contact us today for a free quote and discover how we can improve your home’s comfort, efficiency, and value.