Iver Johnson headshot

In the beginning

Chicago detective, Iver Johnson decided to start a window company focusing on serving local Chicago families with quality products. After working all day he would do business in the basement surrounded by his wife and 4 children.



The Sahara Co.

Sahara Window and Doors

In 2009 Iver was approached about purchasing Sahara Window and Door, another locally owned and operated company based out of Mount Prospect. Shortly after Sahara Window and Door became part of American Thermal Window.



owners inside ATW warehouse


Currently American Thermal window is operated out of two show rooms, one in Chicago and one in Niles. We now have 3 generations of Johnsons making American Thermal the company you know and love today. Iver’s children, Iver Junior & Andrea, and grandchildren (not pictured) continue to work hard to provide Chicagoland the best windows and doors available.