Not sure, maybe already proposed, but i can't find one.
Game already has a "Temperature" value. Outdoor/indoor, heaters, freezers, fire ets.
What about pressure?
- Main 'outdoor' pressure
- Change with weather - higher values when sunny days, lower when rain
- Pressure in the building remains as it was at the end of construction.
- Open entrance or interior door allows you to match the pressure on both sides (this takes some time, in proportion to the size of the building, as well as the temperature)
- Compressors, air pumps. Same as heaters and freezers.
- Random events, when pressure doing high up or down, like temp already.
- All pawns and mobs on map has max|min pressure to feel fine or stay alive.
- Pawns may get ill (hypertension, hypotension, maybe more, i'm not a doctor) when not in comfort zone
(Make vacuum in danger room, wait some, and none of those bugs will hurt you. Or will. )
--- additional features ---
- indoor pressure may go some up or down with temperature (thermal expansion of gases)
- when creating game, when you can select average temperature and frequency of rain, you has additiona slider, for planet pressure. Add some hardcore?
- Show pressure as color map overlay, like Heat Map mod
- ...