

Functionally it is rooms connected by hallways, in terms of the generation. Its just that the hallways might be open(or winding) tunnels or might be dig-able terrain. But they do start the generation with placing “rooms” and then connecting them, which is similar to how other procedural generation methods work.
More info about DRG’s caves specifically: https://steamcommunity.com/games/DeepRockGalactic/announcements/detail/4593196713081471259
Doesn’t just affect temperature, though. Precipitation can change a lot and make an area less viable for native insects.