Yeah, I know. But you also don't want components to overheat, either. That's possible when you have some small, high power stuff embedded in styrofoam, especially if you just stuff in a bunch of uncontrolled hand warmers. I'd like to find some simple way to actively regulate everything. Because the air gets very thin at altitude, ideally you'd not depend on convection but fasten everything to some sort of conductive "cold plate" and then regulate the temperature of that plate. On short flights you can use a thermostatically controlled electrical heater if the heat requirements aren't too great, but getting rid of too much heat can be a problem. I'd like to find some sort of "thermal switch" that would connect the cold plate to an external radiator (e.g., a thin sheet of aluminum covered with thin Kapton tape to increase the emissivity, i.e., make it look black in the far IR). Thermal switches do exist for spacecraft but they're rather new and, like everything else for space, very expensive. I wonder if there's some cheap and innovative way to accomplish the same thing.