Ahhh the broken APU. Reminds me of a few years back, during the winter we spent an overnight in Sun Valley Idaho. It was uber cold that night. I had to run inside at least once during the walk around because the air hurt any exposed part of skin. The station forgot to hook up the external heat and so when we got in the plane it was as cold as a deep freeze. All of the water bottles in the galley and flight deck were frozen to the core. We tried to warm the plane by running the engines, but it just wasn't enough. Not enough "clean" blankets to keep the pax warm either. I think the plane finally warmed up about 15 min from landing in SLC. Good times.