helium air conditioning system
Outer Space / Technology

Almost all Lunar bases employ lighting similar in wavelength to the light produced from the Sun, due to the cycle of approximately 14 days of daytime and 13 days of nighttime on the Moon. Sunlight is captured during Lunar daytime by solar cells, then delivered around the base via a solar ray transport system. The heat this system produces is cooled by placing refrigerated helium in the walls and ceilings of the base, a so-called helium air conditioning system, where the radiation from the helium cools the base. Bases use helium because it will not freeze even when exposed to the super-low temperatures experienced during nighttime on the Moon, which can reach as low as minus 274 degrees Fahrenheit.

This rather simple air conditioning system can also be found on the Tokugawa Moon Plant.