Expert remodeling
Window Installation & Replacement in Smithtown, NY
40 Years of Experience
Certified Professionals
Superior Workmanship with Proven Reputation
Stress-Free Process
Thermo-Seal Windows, Siding & Roofing, Inc.
Energy-Efficient Window Solutions Customized for Smithtown Homes
Looking for reliable window replacement in Smithtown, NY? Thermo-Seal brings over 40 years of experience providing Long Island homeowners with expertly installed, energy-efficient windows that improve comfort, performance, and curb appeal.
From charming homes near Main Street to larger properties off Route 347, Smithtown's housing styles vary—and we have window options to match each one. Our in-house team installs windows that not only elevate your home’s look but also offer long-term savings and protection against the region’s changing weather.
If your current windows are drafty, hard to operate, or simply outdated, Thermo-Seal offers replacement windows in Smithtown designed to last and perform.
Thermo-Seal Exterior Remodeling
Full-Service Window Replacement in Smithtown for Better Comfort and Efficiency
Homeowners in Smithtown often deal with issues like rising energy costs, old window frames, and temperature fluctuations. Thermo-Seal’s replacement window services are built to solve these problems using trusted brands like Andersen.
Our full-time, factory-trained team handles every job—never subcontractors—so your new windows are installed with precision and care from start to finish.
✔ Installed by skilled, in-house professionals
✔ Built for Smithtown’s climate and energy-efficiency needs
✔ Custom styles available to match traditional and modern homes alike
Why Smithtown Homeowners Rely on Thermo-Seal for Window Replacement
Thermo-Seal has served thousands of homeowners in Smithtown, NY, and beyond, completing over 20,000 remodeling projects since 1985. Our focus on quality, reliability, and customer satisfaction sets us apart.
Why Smithtown residents choose Thermo-Seal:
✔ Andersen Certified – Ensuring top-tier window installation quality
✔ No Subcontractors – Every job is handled by our trusted in-house crew
✔ A+ BBB Rating – And multiple Angi Super Service Awards for excellence
✔ Built for Performance – Durable windows that improve insulation and reduce maintenance
✔ Real Energy Savings – Better temperature control and lower utility bills
From Brooksite Drive to Hauppauge Road, Smithtown homeowners count on Thermo-Seal for dependable window solutions.
Window Replacement in Smithtown That Solves Real-World Home Issues
Old or inefficient windows can lead to drafts, high energy bills, and even moisture issues. Thermo-Seal’s replacement windows in Smithtown are designed to address these common concerns with long-lasting, functional upgrades.
✔ Feeling Drafts? Our insulated windows help stabilize indoor temperatures
✔ Old, Faded Frames? Modern materials enhance both aesthetics and performance
✔ Skyrocketing Energy Bills? Energy-efficient glass helps cut costs month after month
✔ Street Noise? Multi-pane options help create a quieter indoor space
Thermo-Seal provides window replacement in Smithtown that not only refreshes your home’s exterior but also solves the problems impacting your comfort and efficiency.
Schedule Your Free Estimate Today
Ready to transform your home’s exterior with expert remodeling that lasts? Contact Thermo-Seal today for a free in-home estimate and experience why thousands of homeowners across New York and Connecticut trust us for windows, siding, roofing, doors, and more.
Request A Free Estimate
Service Area
Services We Offer:
Upgrade Your Home Now & Pay Later – Interest Free!
For a limited time, enjoy convenient financing with 0% interest for up to 25 months.
Contact Info.
Phone Number:
Email Address:
Showroom:
456 Sunrise Highway, Rockville Center NY 11570 - (516) 689-7214
Rye Corporate Office:
411 Theodore Fremd Avenue, Rye NY 10580 - (914) 635-3748
Stamford Office:
263 Tresser Blvd., Stamford, CT 06901 - (203) 990-1812
Melville Office:
68 South Service Road., Melville NY 11747 - (631) 710-6937
CLIENT REVIEWS
What Our Clients Are Saying About Us
Thermo-seal Windows provides exceptional customer service alongside high-quality products. Recently, I had the majority of my home's windows replaced by Aaron's team, and their performance was nothing short of impressive. They arrived on time, maintained a tidy work area, and dedicated themselves to ensuring a perfect installation of the windows.
Aaron and his team were amazing, from start to finish! They worked with us every step of the way and Aaron was always just a call or text away to answer any questions we had. The windows are perfect and we love them. We highly recommend working with Aaron and his team. They are professional, courteous and their work is top notch!
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