Thermo Expert have been meeting your window needs in Berkshire County since 1984.


Whether you need replacement windows, historical windows or new construction windows, you can trust Thermo Expert for all your window needs.

Thermo Expert carries new construction or replacement windows in many different product materials. We offer wood windows, vinyl windows and even fiberglass windows. All the windows are available in many different sizes, colors and finishes for interior and exterior.

Servicing all of Berkshire County. Thermo Expert has supplied & installed windows at the Armory in North Adams, The Pittsfield YMCA, historical windows in downtown Lenox and many homes in Great Barrington.

Thermo Expert is family owned and operated. Our installers are AAMA trained. We never sub-contract work out our installers work full time for us.

Get the best price and installation on the best windows from windows by Thermo Expert.

Energy Efficiency

Our windows come with many options including triple pane, Low-E2, Argon and Krypton gas. Read more about these options.

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Professional Installation

Our installers are AAMA (American Architectural Manufacturers Association) certified, meaning they are elite in the window installation business. Thermo Expert never uses subcontractors.

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Lifetime Warranty

100% Lifetime non-pro-rated manufacturer warranty (transferable to a new homeowner).

Since 1984, customers have put their trust in Thermo Expert.

Thermo Expert is a multi-generational, family-owned and operated business. Our dedication to serving our valued customers landed our company an A+ rating with the Better Business Bureau and being awarded Best of the Berkshires each year since 2016.

AMAA Certified installers check the installations to ensure you are satisfied with your new windows. That’s just one way we go above and beyond!



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Give us the opportunity to earn your business and you will be glad you did. Call today and find out why they say “Trust your windows to the Expert”!

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 voted best of the berkshires 4 years in a row!