This sciency type article discusses the different natural cooling methods available in the Southwest USA: AZ Solar Center

Things mentioned are radiative, evaporative, convective, and passive solar cooling, and also managing solar gain.

What I found interesting was the idea behind radiative cooling. It seems to use the blackness/coldness of space to radiate cold air to a "water pond" film.

At night. panels are rolled back, exposing the ponds to the black body of the night sky and to the cooler night air and breeze. The ponds lose heat by radiation to the night sky and by natural convection to the air. Roof pond systems are particularly effective in regions of low humidity and clear summer nights.

It sounds like something a science fiction space station would do. I guess it's the opposite of solar heating (ie - solar radiation). I've never heard this mentioned before. Interesting. cool