Fan really loud after coming in from the cold

I came home from school today and left my backpack in my car which had my MBA in it to talk to my neighbour for a bit. It's approximately -22 Celsius where I live right now. When I came inside, I woke up it up, as it was previously sleeping, and it's fan (or at least that's what I think it is) was really loud. Ever since I got it, I haven't heard the fan once, and I was horrified when I heard it, so I quickly turned it off. I later found out that I have to let it warm up to room temperature before turning it on. It's been about 2 hours now and I just tried to turn it on again, and I'm still hearing the fan. What should I do? I'm worried because I don't want to harm my MBA, but I also need to use it to work.

Ooh, you should never do that, you need to let your macbook warm up to room temp. before turning it on.
you risk condensation forming inside a rapid warming macbook as the fan shuttles WARM air in the room over the COLD logic board
its not the fan you should worry about, its doing that and causing condensation and corrosion to form from quick temp. fluctuations inside the cold macbook.
DONT do that again, it leads to corrosion.
FAN NOISE:
A: you notice it more in a quiet room (the typical case) which is normal, all is AOK
B: fuzz and dust has caked onto the blades causing the fan hub to get off balance and make a buzzing sound.
C: fan rotor is going bad and making a whirring or buzz noise (rare).
D: Fan is spinning up due to excess heat from gaming, heavy graphics (typical, all is OK)
A and D are normal
B and C are not.

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Fan really loud after coming in from the cold

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