I have one like this....
Vertical kerosene heater.
I've used it to heat my 4 car garage. I have also used a coleman white gas camp stove to put some heat into a double EZ up with walls for a Cub Scout camp trip and it helped significantly so I can't imagine the derosene heater wouldn't do the trick.
Big JT's Smokin' BBQ Competition Team
"The path was worn and slippery. My foot slipped from underneath me, knocking the other out of the way, but I recovered and said to myself, 'It's a slip and not a fall.'"