The Hawk is heated with the Atwood Furnace, and there is a thermal pack. I was very amazed with how well the thermal pack worked. I thought I would feel cold near my head or feet while sleeping (I'm 6'3"), but that was a non issue. We slept with the roof vent 1/2 open and a side window 1/4 open. No condensation. The first night we were way too warm. On the second night I kept the thermostat set just a hair above the lowest setting (analog thermostat). It was a very comfortable temp. even with the window open.
We used one 10lb tank of propane. We were not being conservative with the propane in the least. I preheated the camper long before we went to sleep. The door was left open quite a bit. We only pay ~ $3 to fill the 10lb propane bottle at Costco, so I'm not at all worried about conserving propane on a 2 night trip. We were also using propane to keep the fridge cold. It's funny, because we put things in the fridge, so they don't freeze. Meaning if we left things outside they would freeze.
We always bring the tent with us. It's just used for storage. Nobody sleeps in it. We throw things like lawn chairs, overnight bags (things that aren't worth stealing) etc. in there when we are touring around with the Hawk. We also like the tent because it lets people know the campsite is occupied when we are not there.
We cooked a salmon over the camp fire and breakfast on our coleman stove. I have an adapter and use the spare 10lb propane bottle to fuel the camp stove. We only use the stove inside the camper to make coffee or tea.
The scenery was awesome. It was an wonderful experience. The incredible part is we had the entire campground (practically the entire National Park) to ourselves. There was one other camper (sleeping in a tent). The bathrooms were warm and clean. The showers hot. The wood pile stocked. BTW we pay $8.80 for a fire permit. This gives us unlimited free wood, so we had a healthy fire going the entire time we were at the camp.