Wow, I don't know how I do it then. I'm in IL, and have 1500 sqft of uninsulated house (built in the 40's) with a 30 year old furnance. Our budget plan for natural gas is $80 a month! We keep it at 62 while at work and while we are asleep, with 68 for about 2 hours in the morning and from 4 to 10 in the evening when we're home. We use gas for the water heater, dryer, and of course furnace.
I can't imagine what it will drop to when we got a new furnance and blow some insulation in, we hope to do that in the next few years!