"That sounds really inconvenient. I am pretty sure I can't unlock your planet, and even if I could I imagine it would destroy whatever ecosystem the place has and cause unpredictable changes to weather and so on. But I can do some things that affect temperature. Unfueled fires? Permanent ice? Scaling up enough for you to build a city around the one or on top of the other would take a while unless the day side has a lake for me to start with, but it could help."