Recent install on A14, no mods. I believe this is easy to reproduce.
Have a cooler set to about -5 so that it freezes a room of any size, and make sure that the power output on the cooler indicates 'High'. Turn the 1x1 square where the exhaust goes into it's own sealed room. The temperature of that single square should be absurdly high; easily 80-100. Then, set a vent from that square into a room of any size. I used a huge cavern, probably around 20x30. The temperature is currently in the 60's.
It's a very cost effective way of heating everything, I assure you.
Have a cooler set to about -5 so that it freezes a room of any size, and make sure that the power output on the cooler indicates 'High'. Turn the 1x1 square where the exhaust goes into it's own sealed room. The temperature of that single square should be absurdly high; easily 80-100. Then, set a vent from that square into a room of any size. I used a huge cavern, probably around 20x30. The temperature is currently in the 60's.
It's a very cost effective way of heating everything, I assure you.