I live in a building built in the 80s. I currently have four racks in one room, two per thermostat, one thermostat per outlet (three oulets in the room, another one has a computer and lights on it). My parents seem to think I'm going to overload the electricity in the place because it's an old building. Do you think this is something to worry about? Do multiple racks use up a lot of electricity and pose a risk? Is there anything I can do to prevent an issue?