We found the a/c worked very well on our recent Eastern Caribbean cruise. We had two veranda cabins and kept the curtains open much of the time during the day.
Yes -- they have adjustable thermostats and we were able to keep the rooms very cool. The only problem we had was the terrible humidity, and I'm from Dallas and thought I could tolerate it. It even made our video camera go nuts!
In 13 DCL cruises we have had both comfortable rooms that we could adjust and others that were way too warm (even after adjusting). It really helps if you have a verandah cabin to keep that door closed as much as possible. We go out and then close the door right away as not to let in the humdity!!
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