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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:

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

    Save up to 50% on your windows project

    Contact Information
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    Why Choose Thermo-Seal?

    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

    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.


    Allow plenty of natural light in with these easy to open contemporary windows.


    A garden window is perfect for any kitchen & a perfect way to keep plants healthy.


    Achieve maximum ventilation & clear views with the simple turn of a handle.


    These windows fill any room with sunlight & offer unobstructed views of the beautiful outdoors.

    Bay & Bow

    Beautifully designed & energy efficient, these windows are the perfect addition to any living room.

    Double Hung

    These classic windows look great in any home, offering upper and lower sashes they are one of our most versatile models.

    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

    We offer multiple locations to serve you throughout the Tri-State area including Rye, Westchester County, Melville, and Stamford.

    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