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The No. 1 Window Company Serving Fairfield County, CT

Are you looking for high-quality replacement windows that will add value to your home and lifestyle? If so, Thermo-Seal is here to help. Since 1985, Thermo-Seal has been installing top-quality replacement windows for homeowners in Fairfield County, Connecticut. The craftsmanship and quality of our windows are hard to beat, and we want to show you why.

The Finest Available Windows on the Market

Windows serve as one of the building blocks of your home. They are a critical element in your home’s curb appeal, energy efficiency, and security. Windows are also important for keeping you comfortable inside your home, whether they’re protecting you from the weather outside or you’re opening them to enjoy a fresh spring breeze.

If your windows are failing to serve you in any of these areas, Thermo-Seal has an incredible selection of replacement windows to choose from. We install a custom line of windows made specifically for Thermo-Seal by Harvey Building Products, a leading window manufacturing company. In addition to this custom line, we also install custom windows manufactured by industry greats Pella and Andersen, and we are an Andersen Certified Contractor. Regardless of which manufacturer you choose, there are many window replacement style options to select from including double-hung, casement, picture, bay, bow, and storm impact windows.

The frame material options we have for your new windows include:

  • Custom Wood
  • Custom Thermoplastic
  • Custom Composite (Fibrex®)

At Thermo-Seal, we proudly stand behind the windows we install with a lifetime warranty.

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What Sets Thermo-Seal Apart From Our Competitors?

When you turn to Thermo-Seal to complete your window installation, we’ll provide you with unmatched professional installation and customer care. Every one of our installers is trained, insured, and will complete your project with the utmost precision. Your satisfaction is our top priority, and we’ll go above and beyond to make sure you’re thrilled with your new windows. Contact us today to find out more about why we’re the No. 1 window company in Fairfield County, CT.

We make clients happy.

We Make it Easy

With customer service and craftsmanship that’s second-to-none, we make it easy
to achieve the home of your dreams.
Free, No Hassle Estimates Schedule a free in-home or virtual estimate. We’re here to help!
High Quality Products We offer the best products available, including our own brand of replacement windows.
Satisfaction Guarantee Our job is not done until you’re completely satisfied.

We've got connections.

We're certified by the industry’s leading manufacturers to offer a wide range of top quality options. View Our Credentials

Thermo-Seal Windows Siding & Roofing, Inc. is an A+ Rated BBB Accredited Business serving Westchester County, Rockland County, Nassau County, Suffolk County and Fairfield County. We offer multiple locations throughout the Tri-State Area to better serve our customers.

Showroom
456 Sunrise Highway
Rockville Center, NY 11570
(866) 281-4567
Melville Office
68 South Service Road
Melville, NY 11747
(866) 281-4567
Rye Corporate Office
411 Theodore Fremd Avenue
Rye, NY 10580
(914) 925-3443
Stamford Office
263 Tresser Blvd
Stamford, CT 06901
(203) 663-3534