Well, he is right. Ground stations do not seem to be hooking up ground air anymore, and when they do, it's not good enough for the hot summer sun.
And while we're at it, why are people powering the aircraft with the GPU when the APU is already running? I get that it saves 4 tablespoons of gas per hour, but I've already lost count of how many times the ground crew has pulled the GPU without asking and sent the airplane into Spaz Mode.