I obviously do not know the ins and outs of the situation, but, it saddens me that someone with your influence over readers of this board would be so into oversimplification of the situation. It seems to me that the engineering of the AC in that particular attraction would be complex. You don't run over to a wall and adjust the thermostat and it is done. There are many factors that lead to the temperature within the building. Do we hear this complaint every day? No, we do hear of it if it is extremely high temperatures outside. Seems like a reasonable expectation that it will be warmer inside. Temperature has little to do with it though, humidity has a major influence on how hot we feel. If it is 100% humidity then perspiration will not evaporate, you will feel hot and uncomfortable. If the humidity is 50% you will not be as warm because your cooling system is able to function. Remember that our body temperature is just 1.4 degrees less then 100 degrees.
As an example, just two weeks ago here, it was 104 degrees with 100% humidity. The shuttle bus I drive is usually capable of making the inside of that vehicle cold enough to hang meat in it safely. I was sitting in direct line of two of the cold air vents and water was pouring off me. It was still cold enough in the bus that even though it was a clear day, I had to run the windshield wipers all day because condensation was forming on the outside of the windows from the temperature contrast between the heat outside and the cold inside on the windows and with 100% humidity there was no evaporation. No AC would have been able to prevent that from happening.
Now I know that someone may have sent a directive to turn it down a bit, or not run it as cool as usual, but, surely they cannot be expected to set it, on a daily basis to the most extreme temperature that MIGHT happen. Since Epcot opened a whole new attitude about energy conservation has also become a strong topic. Wasting energy to that degree because someone was sweating a little is irresponsible and environmentally very unfriendly. Sure, they save money by conservation, but, to say that they shouldn't do anything about it because... it's not as cold as I like it to be, is not much of a legacy to leave future generations. Not to mention the equal number of complaints generated for the "I'm always cold" faction of our population.
I'm going to stop this back and forth, because it is just getting me upset about something I have no control over, but, I wanted to point out a couple of things and just saying that someone remit a directive to change the setting is not the end all of the conversation. It is the simplistic, finger pointing, all problems are of one nature only attitude. We all should know better then that.