Having flown them both, there is no doubt that the ground air is MUCH more effective on the A320 for some reason.

That being said, the cockpit is usually cooler than the cabin, so it's hard to tell if it's warm in the back. Some stations have excellent ground air, but most do not. So it's part of my "summer brief" to the FA's to let me know if it is warm in the back. But it is a challenge for sure on the NG. What ain't on that airplane?? The reason the FO does EVERYTHING in that airplane is because it takes me so long to wedge my fat arse into the seat that we are cleared to push before I can get my iPad out