Why Is It So Cold On A Plane?

Passengers on a commercial flight must have sufficient, clean fresh oxygen so airplanes are equipped with HEPA (High-Efficiency Particulate Air) air filter systems which renew air regularly and in sufficient volume.

HEPA mixes outside air with recycled air and filters it for germs and bacteria renewing the cabin air completely every two to four minutes.

The extremely high altitude of the outside air makes this mixture very cold. It would be expensive to heat it and that's why it's cold on airplanes.

In addition, passengers are largely immobile for the duration of a flight and so they generate little heat. 

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