Call your local electric company. I'm guessing it's IP&L? Ask for an energy audit as well as a history of electric consumption for that address. They will come out and look at your appliances and tell you what is the energy hog. They will also look at your windows/doors/attic/etc.. and give you energy conservation tips to lower your bill. They may also give you some certificates to install more insulation, seal your ductwork, clean your HVAC system, install a smart thermostat, etc...
It's well worth the time, IMO.