I did weights and then elliptical with high resistance, taking care to slow down when I saw my heart rate going too high. Still, by the time I was done, my face was scarlet. I was so hot, and my tee-shirt so soggy, that before I started my cooldown (the irony!) stretching, I took my shirt off. It was so wet it was limp. Those sports bras cover quite a lot, luckily, and if anybody didn't want to see a fat lady shirtless, they could look away.
I was about halfway through stretching when a staffmember opened the doors and aimed in the big fan that's usually in the basketball courts (the b-ball games having just ended). That improved things a little.
Out of curiosity, I weighed again when I got back to the locker room; having drunk an entire bottle of water (around a liter? a little less?) while working out, I still weighed about half a pound less than pre-workout. Some of the weight might have been captured in my poor soggy shirt, though, which I did not weigh.
I'm going in the early afternoon today, when it won't be crowded, so will be in the downstairs room. No temperature issues there. I don't think I could overheat two days in a row!