My macbook air fan making a lot of noice

I bought my Macbook air about a year ago, 3 months ago it started making a lot of fan noice while beeing charged or while i'm watching a movie. I think it is a dust problem, but i'm a bit afraid to open it..
What should i do?

If you really think it is a dust problem, it's unlikely that you actually need to open the case to alleviate the obstruction. With a penlight, look into the gap at rear side of the lid hinge, when the lid is open. You will then be able to view the inlet and outlet of the fan ducting. Using a small vacuum designed for the task of vacuuming small crevices on electronics, draw out any accumulated dust on the ports.
It is probably a good idea for you to install an app that will let you see fan speeds and temperatures during operation. The easiest, least expensive way is to use a Widget, called iStat Nano. With iStat Nano, you can make some observations of temps, before and after you clean the hinge slot to see if progress is being made.
If, on the other hand, you see that fan speed is rather high, but temps don't seem to be rising to make such a demand, then it could be that the SMC is a little out of whack. The SMC is the hardware/software system in the computer, among other things, controls the fan speed as temp demands it. Oftentimes, resetting the SMC is all you need to do to restore proper functionality. Apple recommends that the SMC only be reset if it is suspected to be the actual problem, so using a temp monitorig app like iStat should be employed to make that decision.

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