Fans are inaudible until it passes 3000rpm. After that they ramp up to 6500. CPU gets to 100c before it comes down. Sound isn't that bad. Sounds kind of choppy instead of a hiss if that makes any sense but not annoying. That was ripping a movie in handbrake. Watching 1080p youtube movies for an hour the fan never got past 2300rpm and I never heard a thing. Can't say that for my other airs.
Which model Air was that? Was that i5 or i7?