How do you designate rooms.. Like stable, power plant, etc?

[El_Tres]

I am not understanding the room part of the game.

[Alucard †]

That part is pretty straight foward. Make suitable size room and place specific furniture or workstations in it.

In the room overlay it shows you which room requires which furniture/machinery and min/max tile size to count as a specific room.

[SirKnechtalot]

In most cases you´ll miscount the required number of roomtiles...

[Bravo]

You do not designate them yourself, the game engine will designate them for you when criteria are met (ok, so you can designate them yourself by building within the confines of the engine).
A 'room' can only be 1 type of room, so if you have placed buildings in there which would make them more than 1 type of room, you will need to remove the contradictions. The exception would be the 'tier' rooms (e.g. bedroom > barracks, bathroom > latrine, nature reserve > park) where it will only be the top tier room if it qualified for both. This contradiction might come with with a 'remove industrial equipment' if you hover the room in the room overlay.

A room must be bounded (solid natural blocks, manufactured tiles or various doors) region (composed of the opposite group of tiles (i.e. gases, liquids or things such as ladders) of the specified dimensions (for example a stable must be between 12 and 96 tiles). You can for instance make a 12x12 hollow tile square with doors to enter the inside, the inside will be a 10x10 'air' square containing a 4x1 tile elevated platform for a grooming station/critter drop off/critter feeder, with ladders to make everything pathable to make a (96 tile) stable for instance.

[Dopey Shepard]

Originally posted by El_Tres:

I am not understanding the room part of the game.

A room has to have a door and be of certain dimensions. 64 tile room is basically 16 tiles length, 4 tops, if its 3 tiles vertically then you can stretch it

[El_Tres]

You should be able to designate it yourself, the AI in this game is one of the stupidest I have seen.

[chaney]

The game reliably sets the room status on qualifying spaces.

Do you want to be able to "designate" a room status on a space that doesn't meet the requirements of that kind of room?

[El_Tres]

I have multiple levels to my power plant, without doors with ladders, because it's easier to vent the heat and co2 that way, I shouldnt need to enclose it. The need for heavy wires makes it easier to run as well.

[chaney]

Ok, so you don't like the requirements for what makes a room, that's understandable.

In terms of "venting" gas, try Mesh or Airflow tiles.

[AlexMBrennan]

I suggest enabling debug mode; that way you can build the dev generator which provides unlimited power without you having to engage with any of the game's mechanics.