Mercury Excellum Inc.
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Since 1953, Mercury Excelum has been manufacturing high quality replacement windows in our state of the art manufacturing facility located in East Windsor, Connecticut. Our advanced technical and engineering expertise  enables us to produce windows backed with by a lifetime limited warranty and 20 years, non-prorated, for the glass.

Our vinyl replacement and new construction windows are highly regarded for their beauty, reliability, performance, energy efficiency and extensive design options.  Built to last, Mercury windows feature multi-chamber construction, 100% virgin vinyl, block and tackle balances and the convenience of tilt-in sashes. 

We custom manufacture a wide variety of vinyl window shapes, styles and sizes to fit almost any opening in your home. Whether you are looking for bays, bows, casements, double-hungs, rounds, half-rounds, or others, we can custom make your windows to meet your design and energy efficiency requirements. We also customize aluminum storm windows to complement your existing windows.

To view a brochure of our specific products, please click on the links below:



Qualified Contractors
Enegry Star - replacement windows connecticutMercury Excelum, Inc, is proud to offer our customers products with the ENERGY STAR label.

State of the art spacer technology offers superior window performance

replacement windows ct Envirosealed Windows Advantage is an extension of Truseal’s award-winning Envirosealed Windows™ program. Envirosealed Windows™ have the most energy-efficient spacer as measured by their u-value and edge of glass temperatures. With Envirosealed Windows Advantage you build a window with the most energy-efficient spacer, glass pack and frame to produce the best thermal performance and most energy efficient.

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