As a young engineer working in aerospace I found it both surprising and remarkable that the satellites we worked with were all designed to operate at and around room temperature [1].

I could understand that you want to avoid temperature changes as much as possible to avoid stress on the components. But why settle on an arbitrary temperature that is comfortable for humans? Of course I learnt quickly that a room temperature design makes a lot of things much easier;-)

[1] An interesting tidbit is that in certain fields room temperature is used as a technical term to really mean a well defined temperature, and that there is a difference between North American (25 °C) and the European (20 °C) convention.