Power Hungry air conditioning ?

From:         crazy!a904246@uunet.uu.net (Chris Wesley         (0013 cxw ))
Organization: Texas Instruments
Date:         14 Mar 95 02:34:36 
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I was taking off from Mombasa last Monday and was surprised to hear the pilot
advice us that - due to the high outside temperature causing lower engine
efficiency - he would be turning off the cabin air conditioning during takeoff
to get more power.
Does the air conditioning consume a significant portion of the engine power ?
I thought it was driven from the APU anyway.
I'd appreciate your comments.
Thanks & Regards,