So I have an AC unit outside my room onto which a whole bunch of water falls from straight from the gutter. Will this ruin the unit? Also, it makes A LOT of noise. What would be the best way to dampen that?
The outdoor units are meant to have water hit them. Only a flood or major major standing water would hurt the unit - unless the water came down at such a high rate that it bent something.
Go outside and look at your unit. It will have a "section" or box with the electrical compontnents. It would basically have to flood to that height to hurt your unit.
Water could have a good impact in that it would cool your unit and clean off dirt and small debris. I can't really see how this would hurt anything.