My macbook air is making crazy noise and crazy heat.

It's been only one year since I bought this laptop but it's been making crazy noise and crazy heat since few months ago.
Didn't really notice about the fan noise until I went to a really quiet university library yesterday.
everyone's macbook is real quiet but mine's making some seriously disturbing noise.
What's the problem of my MBA 2011 11"?
It also laggs a lot. Is it time to replace my MBA?

First action to take in this situation is to fully backup your data, possibly a clone.
Take the computer to an Apple store to have it checked out.
Best.

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