Why Does the Space Station Need an Air Conditioner

In space, heating and cooling occur only by way of radiation � objects are warmed by solar rays warm and cool off by emitting infrared energy.

Without thermal controls, the Space Stations Sun-facing side would heat to 250 degrees F (121 C), while thermometers on the dark side would plunge to minus 250 degrees F (-157 C).

Source:
http://www.motherboard.tv/2010/8/4/space-is-freezing-why-does-the-space-station-need-an-air-conditioner--2