I suggested going for heat capacitance with a stone hearth before, but I was assuming a small shelter. 7'x9' is pretty big, you'd need to do a LOT of fire babysitting, and burn a LOT of wood. How much...
I'm pretty used to sleeping in the cold, so I'm not worried about keeping it hot all night. Mostly that I just want some place during the day to be warm.
Six feet down might be a better idea, but I'm a little bit concerned about whether the tractor can pull that off. Also, I don't want to use too much diesel considering how expensive it is right now.
Six feet down might be a better idea, but I'm a little bit concerned about whether the tractor can pull that off. Also, I don't want to use too much diesel considering how expensive it is right now.