Originally Posted by overstress
If the cabin of a widebody is hot before pax boarding it will get a lot hotter when 200+ pax get in there with their 60W each.
I seem to recall a figure of 175 watts per adult for the planning of public buildings. [I don't know if this figure has been safety factored.] To put it in perspective, that would give 35 one-bar electric fires in the cabin.