If your case is closed, there is little risk. If the cold air is blowing through your case, be careful when you turn the AC off. The metal case will still be colder than the air. This might case some moisture to bead up. You don't want that to drip inside your case.
the AC lowers ambient. you still will not be able to go subambient if it blows inside your case.
just open up the front of the case, guide the AC in, and make sure it gives a little positive pressure to keep the warm air out, preventing any possible condensation. if you want to add fans, add them to the AC unit, and suck/blow air trough it.
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