Couple of thoughts:
1) I would be leary of putting a fire too close to a debris shelter because of the fire hazard and the fact that I would also be using the fire to cook. Not a good idea to have food scents too close to sleeping area.
Food scents are all over your body regardless of where you cook and you not will fool Mr. Bear any easier by cooking away from your shelter. And yes bears do sometimes come out of hibernation in winter looking for food. Maintaining a bare and clean campsite is crucial and will go a long way in preventing any midnight visits.
Also it is still a good idea not to cook or leave a fire burning in your shelter if it is made of mainly dry wood and debris.
3) Heating rocks, or aluminum water bottle, enclosed candle, putting coals in a pot, etc might be options to warming the inside of a well constructed shelter.
Heating rocks in a covered cast iron fry pan over a campfire then placing the pan into the tent on a solid and stable piece of wood = a nice warm night. I did this every night in the cooler months when I lived in a tent out in the woods and beside a river for almost 9 months years back.
Then again, I will readily admit that I've never spent the night in a debris shelter yet, so my tune may change as I freeze my tilly-tail off...
Most likely many tunes will change...:)
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