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Our Background

Thermal Sash Window and Door Systems is locally owned and operated in Chester County, PA, by John and Marcia Herman. John started providing homeowners with energy saving replacement windows in 1982, working for a window dealer in Allentown, Pennsylvania.


After a couple of years learning the business, he joined a firm located in Chester Springs, and eventually purchased Thermal Sash Windows and Doors, serving Chester, Lancaster, Bucks, Lehigh, Northampton, as well as the counties surrounding Harrisburg Pennsylvania.


With over 31 years of experience visiting homeowners, sitting at their kitchen tables and developing strategies to improve the energy efficiency of their homes, you can be assured that you too can have a rewarding experience bringing your home into compliance with today's energy standards.

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