If you are looking for expert window installers who can get the job done quickly and efficiently, choose KAS Windows LLC, based in Mattoon, IL and Champaign, IL. Our company uses only the best window products for all the projects. We are the registered dealers of Alside and Polaris. Would you like to know more about our window services? Call us today! You can also fill out the form below. We will get in touch with you.