Funny you say that, PSB is using one in the desert and it cools his room and only raises the humidity to 65% and that's great for plants.

Yes you sure do need to be prepaired for mildue or mold but a vapor pot does the trick and even will deal with spider mites too. It changes the Ph of the outside of the life to the point where they runaway and stay away. The ph change does not affect the plant either but they do cost about 125.00 bucks too.

Look you can always pick it up and try it for a few days and see where your humidity goes, then take it back and get an A/C that will work.