Thermolite's patented window systems install on the interior of existing windows to deliver superior performance and appearance at a fraction of the cost of replacement windows. Secondary window systems address building envelope issues, including energy conservation and comfort, by increasing insulation value.
Our interior window systems are able to multiply the performance of existing windows by reducing heating and cooling use as well as demand. In general, total building energy performance can improve by up to 25% in cold weather climates when our secondary windows are utilized.
Full range of laminated, suspended film, insulated and low-emissivity coatings
Between-glass blinds lower solar heat gain in the summer and raise it in the winter
Easily attaches to fixed, storefront and curtain wall framework
All aluminum construction- custom colors and contours
Sound control window systems available at STC 49
Hurricane commercial storm windows and blast mitigation security window options without affecting sight lines
Since 1979, Thermolite has been a leading innovator in secondary interior window systems. Thermolite is a GSA-certified federal government contractor serving areas nationwide with notable projects in Washington DC,Philadelphia, New York City, Chicago, Detroit, and more. We work with a variety of industries to improve their building performance through interior window retrofits.