I have figured it out.  They seem to turn the AC on in the fitness center around 7am.  Before that, it is warm and incredibly steamy.  After they turn it on, it seems to take about 30 minutes to make much headway in reducing the humidity.  Since I hit the gym around 5:15AM, I did most of the workout in the fetid, steamy soup.

Plan:

1. 60′ Elliptical
2. 60′ Stationary bike
3. HR cap at 155

Reasonably happy with that.  It was a looong, boring session, but I think I got the intensity about right.  When I finished on the bike, I discovered I had mad a huge sweat puddle under it almost 2 meters in diameter.  It took two towels to clean it all up.  I wanted to get a picture of it, but the lighting was wrong to really see the extent of the flood.

Tomorrow:  4×30′ on four different machines.  HR cap at 155.