Hey guys, I think I found out why my PGE bill spiked so badly...
I had been keeping the house quite cool (cold) to try to keep the utility bills down, so my housemate went out and bought one of those little electric space heaters. Ack! He is really bad about keeping stuff on and I came home one day and walked into a wall of warm air coming from his open bedroom door. Lo and behold, there was the little space heater, cranking away, all 1500 watts (almost more than all my tanks' lighting combined, heating a room and hallway with no one present. (He wasn't even home.)
We had a *talk* and we're going to try to turn up the thermostat (gas house heating) and unplug his space heater.
Discovered this towards the end of last month's billing cycle and the PGE bill is still astronomical ($550), but $100 less than last month. I am hoping that this next month I will be closer to $400 which will be more in line with my past winters.
I am going to try keeping the Maristar (MH + T5s) on Bonnie's tank for now and hold off on swapping to T5s. As some have stated in this thread, it might not make that big a difference, esp since I usually run a reduced light cycle.