On day two of FrostBurn, I felt pretty hungover. Needless to say [or is it?], I skipped all alcohol today. My shelter had made it through the night, although there was no reason it should not have. I spent some time resting inside the shelter and with the heater on, the temperature easily climbed to over 70°F. All my water and soda had frozen so I put it inside the heated "bath house" — thankfully this year, we had access to heated bathrooms.
That was the night of the burn, too. The guy who made this year's effigy did a great job and burned well. It really looked like a snowman, too, since the body was made of three multifaceted approximations of spheres. There was another Jason — "The Jason" — who was the poster boy of the festivities. He ran around with a bottle of Jameson's in one hand and champagne in another, all the while with a toy monkey on his back.
That night I got to do the official winter shelter experiment: not use the heater. When I got inside, it was 18°F. I had calculated that the 84 or so square feet of the R-3.3 "Tuff-Board" stuff would allow the interior temperature to be about 20°F higher than outside with just one person inside (assuming they'd produce about 75 watts of heat). After an hour or so, the temperature had climbed to 26°F.
That's still really friggin' cold so I turned on the heater and quickly brought the temperature into a more temperate range.