Don't be embarrassed to mention this stuff. It is routine work to adjust the ventilation to match the needs of the occupants of an office building. That is especially true if your new floor was recently renovated. There's no way for the heating / ventilation / air conditioning (HVAC) people to know unless you tell them.
What is the best solution for me?
I suggest you approach HR or your manager, and tell them about this.
Say that currently the AC is distracting you from your work, and ask what can be done to solve it. You can then work on a solution that is Ok for everybody.
Taking a guess, I assume that the AC stream can be redirected, in a way that it does not point ...