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Professional Window Installation Services Available to Residents of Manhasset, NY   

Are your house windows old, worn, and in need of replacement? If so, now is the time to turn to the professionals at Thermo-Seal Windows & Siding. Since 1985, our skilled and experienced team has proudly provided exceptional window installation services for homeowners throughout the Manhasset, New York, area. We have a long list of satisfied customers, and we look forward to showing you why we are a company you can depend on.

The Replacement Windows We Offer  

At Thermo-Seal Windows & Siding, we have our own line of custom windows. These windows are manufactured by our partner, Harvey Building Products. We also install top-quality replacement windows that are sourced from Andersen and Pella. Both are celebrated for crafting top-quality products.  What’s more, we are an Andersen Certified Contractor, ensuring we have the know-how needed to expertly install these replacement windows.   

Our replacement windows are:

  • Available in different materials, such as wood, thermoplastic, composite, and vinyl 
  • Crafted in popular styles, including slider, garden, casement, picture, bay, bow, double-hung, and completely custom shapes 
  • Energy efficient, which means they can help lessen your heating and cooling expenses by up to one-third 
  • Easy to care for and require minimal maintenance 
  • Able to mitigate the infiltration of outdoor noise 

And for your peace of mind, our replacement windows are backed by a 100% satisfaction guarantee and a limited lifetime warranty. This covers defects or seal failures on all mechanical and vinyl components.

Contact Your Local Window Installation Experts Today 

For more information about our replacement windows, contact Thermo-Seal Windows & Siding today. We look forward to working with you and answering any questions you may have about the windows we install in Manhasset, NY.

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