Trying to move the OT discussion over here.
Originally Posted by siliconflyer
Agree Kix. When outside is -50C as is at cruising altitude, bringing upto 28C is less "eco" than say 23C.
, I have posted the explanation from Boeing earlier below.
Racist meal service?
Basically the outside air is not dense enough and has to go through the engine compressor to pressurize and the air is heated too as a result. After that those air has to be cooled by the AC system before getting into the cabin.