The heating element (or the temperature gauge) went out. I didn't look at it too hard, so I'm not sure the cause, but it was constantly heating to about 90 degrees F. So it's now unplugged and works perfect. On a related note, I could've bumped a sensor and messed it up, but, as I said, didn't look to hard.
I think the heating element broke, so I unplugged it. I now cool the office where I keep it, and I've totally removed the water basin for more storage.