This is either going to horrify or make you laugh hysterically, which 99 times out of a hundred is the highest praise I can heap on something. Don't know much about it other than the guy who made it did some work on South Park, and this was done as a pilot for either MTV or Comedy Central.
WARNING: Not dial-up friendly. It's like 23 mb., but SOOO worth it.
What works depends on the furnace. During our ice storms last month, the high efficiency furnaces wouldn't operate with a standard generator as he power supply is too variable. One guy burned up his furnace motor.