Depends on how fast it happens, what happens to the heat in the area, what size of an area it is, and a lot of other questions. Frankly, it boils down to how you want to present it, since as far as a quick google search has told me, you're violating the laws of physics in a big way regardless of how you do it, which is kind of the point of psi-epsilon. For example, if it happens very quickly over a broad area and the heat is simply shunted aside, you basically have a bomb. I'll leave the particulars to the STEM majors here with some eagerness to see what they have to say, but another thing you'd see is a lot of system failure. Almost everything built to survive space need to cope with waste heat -- for all the "space is cold" tropes, the fact is it's much harder to get rid of heat in a vacuum. Supercooling a space habitat isn't something most engineers would plan for when building, so beyond obvious things like life support/water pipes freezing and exploding (or for that matter, gas lines doing the same thing), a lot of systems are going to be damaged in the area of effect even without a bomblike effect. Electronics will fail, anything with liquids will freeze, a lot of materials will become very brittle or even shatter...bottom line is, it's going to suck.