Cel Sci Corporation (CVM)

[lightrock]

Officially I think it is on average 600 electric watts, to power a gas furnace (fan)

But, when it comes to anything electric, I always go with more, stuff lasts longer and works better.

There is also a product-line called Mr. Heaters. They have units designed for indoor use. They are more expensive but they are less likely to kill you. You gotta watch it with carbon monoxide otherwise. get the right stuff for indoor use, or you are at great risk from doing something tragic, with those. You can power these things with propane tanks. Two of 'em is probably good enough to keep any ordinary house from freezing.

If you can get gas, then maybe an inverter is a good idea, if you can't get gas but you can get propane, then the little heater thingies are maybe a better idea.