But... I really don't know why you're asking about internal temperatures between the Pro and the Air. It's different hardware. If you should be concerned about anything, it should be the peak temperatures of any device versus its breaking temperature, and its outside temperature (how hot it would be to your palms, fingertips, lap, etc). If a processor has a breaking temperature of 60 celcius, and it reaches 60 celcius a lot, then that's a bad processor... but you aren't asking about breaking temperatures. So I'm not sure what you're concerned about.
The appropriate answer to your questions is this: The Pro runs cooler than the Air, but when it comes to most everything, you won't be able to tell the difference to the touch (nor through listening to the fans). Both will be rather silent, and both will be rather cool. When it comes to encoding videos, running photoshop and doing intense work, playing intense games (like Starcraft 2), and doing other very intensive things: You're going to notice the Air gets hotter, and that its fans are louder.
So the gist of what I'm saying is this: Get the Air if you want to use it for what it's designed for; and that's as an ultraportable device. If you want an ultraportable gaming laptop, go buy a Dell Alienware MX11 or whatever it is. If you want a gaming laptop in general, then go buy... well... a 15-inch Macbook Pro I guess? I don't know.
I notice there's quite a few people who want it all with laptops, and they want it now. They want an ultra cool laptop that literally runs cool, has decent battery life, can run games at mid-high, is super thin and super light and super small, and this and that. The Air is first and foremost a portable laptop; what comes second is great functionality. As you push the Air, it becomes a worse and worse laptop (it will get hotter, run louder, battery life is diminished more quickly); however it is perfectly capable of these things, which is nice to those who need to use it for those sorts of things from time to time. If you're expecting a computer to be a workhorse 24/7, gaming, being productive, watching videos all the time, etc... and obviously you want it on the go (since you're looking at laptops) so you want battery life... then look at a Windows-based laptop, or a larger Macbook Pro (I suppose the 13-inch Pro would be fine if you don't need huge graphics capabilities). Definitely don't get the Air if you want it all... it's nice that it's ultra thin, but if you also want to do intensive gaming all the time... you're not really in the day and age of ultra-thin ultra-graphics laptops.
