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Winsulator Today = Preservation Tomorrow

Winsulator secondary glazing inserts fit seamlessly and invisibly into historic structures, maintaining the historic look of the property.

Trusted by The Courtyard at Lake Lucerne, Chatnam County Courthouse, Highlands County Courthouse

Make old, historic windows perform better than new ones! We provide a secondary glazing inside the interior window cavity that allows historic homes keep their beautiful old windows without all of the energy loss and noise!

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“A rather invisible solution to leaky old windows”

— The Post & Courier

Choose Winsulator magnetic inserts for your historic buildings!

Our windows are trusted for historical buildings across the country. The reasons are simple.

  • Removable: The magnetic seal on our panels and the lightweight acrylic glazing make them easily removable for cleaning, maintenance, or egress when installed on historic windows.
  • Invisible: Since Winsulator magnetic inserts are installed on the inside of the window, they do not change the look of the window from the street.
  • Reversible: If necessary, every part of the Winsulator magnetic insert system can be removed and the existing window restored to its original condition.
  • Effective: Historic windows are not “energy efficient”. Winsulator can change that!
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