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Therm-O-Lite Inc.

Therm-O-Lite Windows is a 25-year-old veteran owned small business based in South Bend, Indiana. Therm-O-Lite is a US manufacturer of interior supplemental window systems. As originally designed, the product provides building owners with a cost effective alternative to prime window replacement, while providing significant improvement to the energy efficiency of the building.

In 2001, Therm-O-Lite modified its original design from a vinyl window to an aluminum window and incorporated a patented technology known as “Compression Release Technology” to provide blast resistancy. In August of 2002, the Therm-O-Lite blast resistant window system was independently tested and has received the highest rating conveyed under the GSA Interagency Security Council (ISC) performance criteria.


635 S. Lafayette Blvd.
South Bend, IN 46601
Phone: 574-234-4004
Fax: 574-234-4005