Yes, but isn't Chicago on Central time? Changing to that time would mean that it gets dark at 4:30 PM in the winter. That's an hour before most of us get off work. How does your current system work? Do you have DST for part of the year and Eastern the rest of the year? Or are you already on Central?
Some counties around chicago and evansville are on Central Daylight Savings Times. Most of the state is on Eastern Time with no daylight savings. And some around Cincinatti are on Eastern time with daylight savings. Most of the state never changes their clocks, but the others do.