Actually, it is that easy. It happens all the time. And it may not be your job to physically turn off the ground A/C, but it is your job to maintain a safe atmosphere. Say an old lady passes out because it's "not your job" to turn off the 100 degree external air when the ramp won't do it. Who's going to have to talk to the lawyers? The person in charge of the aircraft. So in that sense, it is my job to go turn it off if the ramp doesn't do it.

That attitude is the reason we are the butt of all the Internet jokes about poor customer service.

/Cranky and hot commuter
//Turn the air on!!