I've searched around on the interwebs but can't seem to find any answers to my problem. So it's 100+ degrees here in Missouri and my apartment is a lava pit. I have the AC on full blast and it's doing the best it can but the heat just won't dissipate. I followed the source of heat around my apt and found that my little water heater and the house heater (like the heat for winter) room next to the bathroom was skin-melting hot. There are two switches in that little room and last night I turned them off and voilà, problem solved. The heat went away and my place cooled off. But today when I came home from work the apartment is retched hot again and the heater room is just as hot as it was- even though the two switches are still off. Does anyone know what these switches are doing and what I should be doing to make the awful heat stop?

Tl;dr Why is my hot water heater/heater so hot and how do I make it STOP?