Just saw this on another board:
Cabins were very hot, huge numbers of people slept outside on lounge chairs. .
I personally was happy somehow throughout, and satisfied with compensation (50% refund plus 50% off future cruise). They put me up in a very nice hotel (marriott resort), gave me $40 food voucher for the hotel restaurant, shuttle to hotel and airport. They did an excellent job arranging new flights for me, even though I had not booked my airfare through the cruise! It was my first Carnival Cruise, but I'm already looking for my next one thanks to the 50% off voucher.
Staff mentioned aircon disaster had happened to same ship in a prior year.
A second disaster was attempting to leave the ship. Pulled into port at 2pm, I didn't get off til 8pm, many leaving after I did. That's 6+ hours. I spoke with people who got off Jubilee the next day, they said it took them 5 hours to get off, so Puerto Rico is having some problems as a carnival cruise port right now. Someone said something about a strike affecting unloading.