Here’s something to think about the next time you’re complaining about how cold it is outside. At least you’re not stuck inside a tauntaun trying to stay alive.
In a normal environment, a carcass gets cold in 8 to 36 hours losing an average rate of 1.6 degrees Fahrenheit per hour. However, the ice world of Hoth is not an average environment. The Star Wars database lists that Hoth reaches nightly temperatures of -60 F. In a frigid, sub-zero environment, body heat can be lost almost 32 times faster. This means a Tauntaun’s body heat could drop almost 51.2 F every hour. Considering that Han Solo’s Tauntaun died of severe hypothermia even before it was cut open with Luke’s lightsaber, one could assume it’s core body temperature was already well below normal.
The problem for Luke is if the Tauntaun’s body temperature reaches freezing point those once toasty guts, blood, and assorted alien goo, will in fact become a frozen coffin. If the Tauntaun died of cardiac arrest due to hypothermia with an average body temperature of 75 F (23 C), and if Tauntaun blood freezes at 28.4 F (-2 C), then Han has roughly 56 minutes to set up a shelter before Luke once again is in danger of losing his life in the barren wasteland of Hoth.
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How Long Could Luke Survive in a Tauntaun?