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About Therm-O-Loc Windows

Therm-O-Loc Windows has been building vinyl windows since 1984. We have always used only top-grade virgin vinyl in all of our window frames and sashes. Decades of experience has given Therm-O-Loc the expertise needed to build the highest quality windows on the market today. We are deeply committed to product excellence and customer service and satisfaction. Today you have many choices in style and quality, and we do our best to give you both. We are always looking for ways to improve our vinyl windows. We are dedicated to treating you as we would like to be treated. This includes honest and reliable service. If we say we’ll come out to give you an estimate or install your windows, we will do our best to be there on time. Our vinyl is extruded by Vinylume Products in Youngstown, Ohio. Vinylume is owned and operated by motivated fourth-generation craftsmen who work hard to give you high quality vinyl profiles for many years of hassle-free use. With the standard LoĒ and argon glass package, all our 1000 series Double Hung, Slider, and Picture windows, and the 300 series Casement windows meet the ENERGY STAR® requirements.


We are shipping to any location in the United States. Whether you are a residential homeowner, a business owner, or a contractor, we’ll be happy to help you decide which windows and options are best for you and give you prices and a shipping quote on the windows you are looking for.

Contact your closest dealer today for a free estimate or help in choosing your windows.

Get a Vinyl Window Estimate