does anyone have a link to, or actually tested the amount of interior temperature change a small kerosene lantern (1/2" wick, around 900 BTU/hr) can actually effect in conditions like those currently encountered?...I understand there are a lot of variables eg. interior volume, insulation,... just wondering on the temp change you can expect under actual conditions... normal safety warning
I would be very careful about using any appliance with a live flame in any enclosed space - carbon monoxide. We will probably get a media story about deaths from people who fired up their barbeque grill or other makeshift device in order to keep warm - this unfortunately is a very predictable occurrence.
This is one reason I stash a flameless heater in my kit, although those evidently are no entirely hazard free, either. I have used backpacking stoves (Svea or similar) briefly and gotten away with it. They will raise the temperature noticeably, but unless your space is well insulated, the heat goes away quickly.
It is much safer to just bundle up and snuggle with a warm, receptive partner than risk CO poisoning - voice of experience here. "There is no such thing as bad weather, only bad clothes."