The only time I've ever heard a PS3 get loud was at my brother-in-laws house. And that's when he didn't have his AC on and his PS3 was set in an entertainment center with the doors closed.
When it got loud, which it did get pretty loud, I opened the doors on the entertainment center. Ten minutes later, it was running silent.
PS3 heat+noise=you people sound crazy to me
Just from personal experience though with the 3 PS3's I deal with. My PS3 doesn't let off anywhere near as much heat as my XBOX 360.







