I don't make commuting an aerobic work-out.
For me, the goal is to get to work, have an enjoyable ride, and be safe.
I do step it up for short stints, but nothing that will get me sweating profusely.
Honestly, though, I don't have to deal with 95 degree weather on a constant basis, so there may be some other tricks to the trade for the heat riders.
Some cats actually pack work clothes separately and even shower at or near work. I never had that much time or appetite for fiddling about with dressing and grooming at the workplace. I like to get to work, go to my office and get crackin'.
When suits and neckties were in, I wore suits and neckties while I biked - looked just like a British tea commercial. I'm glad the suit and necktie fashion finally died.