We had Illinois Energy replace all of the windows on the main level of our house, 7 windows total and a sliding glass door. We could not be happier with the end results! Our windows went from a dark brown to a brilliant white and it is amazing how big of a difference the new windows make in our house. The new sliding glass door looks wonderful and all of our windows and the doors are so much less drafty! We immediately felt a difference! We replaced a bathroom window with a glass block window and it looks amazing! Such a huge difference it makes to our bathroom! Illinois Energy did incredible work and we could not be happier with our new windows! The people who we worked with from start to finish were the epitome of professional, from the salesman all the way through the process to the final walkthrough. We were just recently married and this was the first major upgrade we had made to our house and they made us feel VERY comfortable with their company and our decision to ?take the leap? of investing in such a huge project. Every one of our questions was answered and they even went beyond and replaced trim halfway through the job that we decided we wanted to change! Our whole experience with Illinois Energy was wonderful and we are so happy with everything about their company and their products. We will definitely use them in the future for the rest of our housing upgrades!