Electric bill went up 78%...
Our utility has a split fuel charge where anything up to a certain point is billed at a lower rate, but once you go over that point it's billed at a much higher rate. Too many KWh over and it's a very noticeable increase.
My bill used to run 130-150.
I installed a programmable T stat about 7 years ago, and it's rarely over $100 anymore.
A "logical" program makes all the difference.