ATC Insulators - Germantown Hills, IL, ATC Insulators, in Germantown Hills, IL, is the leading insulation contractor serving Tazewell, Fulton, Woodford, Knox, Peoria, and all of Central Illinois since 1981. We specialize in high-performance Icynene products and other thermal solutions such as Cellulose Fiber products, Insul-Tarp, and BIF Systems. Whether it is a new home, existing home, agricultural building, commercial space, addition to your home, or even crawl spaces, basements, rim joints, or attic areas, our certified and licens.