Some of them do have their own AC, though, that’s what I wanted. Just piped in through a vent.
As for keeping things open, there’s just a curtain, but it still gets warm in there. I had the curtain open for the last half of the night.
I’m actually quite cozy in the capsules when the temp is alright. I’m sure based on what you’ve said that you’d be just fine too and might enjoy it!