By the way - there are 2 industrial heaters now. Not sure if they both work.
And coal burning plant (fuel also, but not stated) IMHO eats fuel too fast. Something like 0.1% per second. So in 16 minutes of real time you lose stack of fuel or coal.
And in the long run I think temperature generation should be reworked somehow. In my current base I rely mostly on 6-8 campfires, while 6 heaters use lots of electricity, but give low temp.
Ducts are also questionable: 1x6 room with bed - door on one side and duct on other. "Outside" indoors have 18-21C, the room inside it 6-10C (Real outside temp is around -40/-60C).