"Thanks for sharing several great points and suggestions. Diesel heaters are fantastic. I have a gas truck, and having a diesel heater means that I will need to carry a different type of fuel, but that's fine if I reach the conclusion that Diesel heater is the way to go.
As for the inverter generator, if I want to solely rely on it and the electric heaters, I will need three gallons per day to feed a Honda 2200 (which is the smallest generator that may be able to handle the needs). For 7 to 10 days I will need 20 to 30 gallons of gas, and I need to carry some more just in case. That will be a lot of gas to carry, but is possible for when I am close to a gas station which are not abundant in northern Canada.
You are so right about cracking windows not being a realistic option to do all the time in subzero (f) deg.
You are also so right about human being adapted to what happens around her, including the noise. I may give this a chance, and look at other (costly) solutions only if it fails."
Stop for a minute and think about what you're trying to accomplish here.
It appears you understand the unique needs to be prepared to camp in sub zero temps, but you'll need to accept that whatever option(s) you choose, you'll need to burn some real fuel. Besides, it'll be dark most of the day so you're burning lights alot more too.
Packing 3 people in a can in the dead of winter and dealing with moisture and heat and running water is a unique challenge.
Look at your battery situation too. I'd be stacking 4 6Vs in that thing and a big @ss converter to charge them so that you don't need to run the genny 24/7. Then figure out how to heat the place with the least amount of fuel and power used.
Propane is not the answer. You'll probably blow through a 20lb bottle a day in those temps with a forced air furnace.
Gas powering a generator to power at least 2 electric heaters 24/7 (where do you even put them conveniently) is not the answer. Yes IF you have shore power, maybe, yes if it's for occasional use, yes if its warmer, but you don't have any of those things.
The answer is diesel, IMO. Packs the most btus per volume of common fuels.
Then figure out your water and tank heat situation.
