Quote:
Originally Posted by HarryT
I've no idea whether or not it's true, but it would save money because the cold air brought in from outside the aircraft has to be heated. If less air is being brought in, there's less heating required.
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According to:
http://www.boeing.com/commercial/cabinair/index.html
the air comes from the jet engines, so has to be cooled rather than warmed.