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Window Replacement

Thermo-Seal has been providing high quality window replacement services to customers throughout the Tri-State area since 1985. The excellent craftsmanship and value of our windows are hard to beat. We’ll help you select the windows that are the right fit for your home, and then install them professionally for the peace of mind and energy savings you deserve.

Custom Windows to Suit Your Home

Our custom line of windows manufactured exclusively for Thermo-Seal by Harvey Building Products are available in a variety of beautiful styles to satisfy any need. In addition to the custom line we provide for your home, we are an Anderson Certified Contractor. This allows us to offer a wide variety of styles and materials, all with an energy efficient design and backed by our lifetime warranty. Material options include:

Save up to 50% on your windows project

Contact Information


Why Choose Thermo-Seal for your Windows?

Rely on Thermo-Seal to provide a window that’s maintenance free, durable, airtight, and energy efficient. Contact us today for a custom window plan that will bring comfort, beauty, and satisfaction to your family year after year.

Professional Installation - When you hire us for your replacement windows you will be working with a professionally trained and well experienced company. Our installers are fully trained and insured.

Customer Care - Our client’s satisfaction is our #1 priority. We make sure to get the job done correctly, and to the highest standards. You will never be disappointed with our work! We are highly rated across home improvement review websites, and love all of our positive feedback!

Andersen Certified Contractor - We have been vetted, trained, and backed by Andersen Windows & Doors, the industry's #1 most trusted and recommended brand of window and doors.

Andersen Windows & Doors logo

Exclusive Custom Line - We've partnered with Harvey Building Products to offer you an exclusive line of windows manufactured just for Thermo-Seal.

Harvey Building Products logo

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Lifetime Warranty - Thermo-Seal windows come with a limited lifetime warranty on all vinyl and mechanical parts. This warranty covers any mechanical defects or seal failures.

New windows and window replacement in Westchester County, NY and Fairfield County, CT.

Benefits of Replacement Windows

Not only will you enjoy the beauty of your new windows, you will also:

  • Cut monthly heating & cooling bills by up to one-third
  • Stay warmer all winter, cooler all summer
  • Reduce exterior noise infiltration
  • Eliminate window maintenance
  • Enhance the “curb appeal” of your home

Window Styles

Windows from Thermo-Seal can be designed to fit virtually any opening and are available in vinyl, wood, or composite. Choose from our most popular window styles, or let us know if you're looking for something custom.

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.

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