OK, apparently missed 15 pages so please forgive if I repeat (or don't). ... But no AC is very worrisome to me. Now, I have been to places and ridden longer gondolas in very hot climates (Hong Kong's Lantau Island and the Azores come to mind as two ... they have one in St. Thomas too, but I really can't recall whether I have been up it). ... That said, all of my rides came in temps below 72 degrees. And, most importantly, they had very good air circulation.
I would hope for the same from Disney, but take nothing for granted. I'll never forget standing in a lightning storm with NO protection at EPCOT in 1995 awaiting a bus to the A-S-S (a great place to visit in the end) and Disney had opened the resort 9-10 months earlier and didn't have a covered location to pick up and drop off Guests at EPCOT yet. A complaint was made and we wound up with a comped dinner at the food court, which at that time had an amazing prime rib dinner (with 2-3 sides and a roll) for $10.99 (before the 20% discount). In other words, Disney made out well for Guests pointing out a terrible Ops oversight that never should have happened, yet was allowed to well after the resort opened.
If air is moving around and people are not baking, then it should be OK ... no circulation is another matter. I did the London Eye once (cabins have AC) and the air circulation was not adequate for an 80 degree day. I almost had a major anxiety issue. ... Why I am in no hurry to try O-Town's out!