Originally Posted by Waterhorse

A real life example: I was presented with an aircraft with no APU in the middle of the summer. On boarding I found that the temperature was in excess of 38c. The aircraft was presented as fit for service and would just need a starter air cart and crossbleed start on pushback. There was no cooling air available and airport regulation forbade running an engine to cool the cabin. I had walked through the departure lounge just prior to boarding, there was, at least , 10 babes in arms in the departure lounge.