I decided to ask Facebook for advice: Which bars in San Francisco have air conditioning? Here's what I've found so far:
- Bear Vs. Bull
- Benjamin Cooper
- Clock Bar
- Forgery ("is nice and cool inside with or without A/C")
- The Interval
- Parallel 37
- Press Club
- Rusted Mule
- Rye ("We try to keep it at around 68/70")
- The Saratoga
Let me know if you know of any more.
Certainly more hotel bars will have a/c, so you're usually safe there. At least, safe that it will be cool, not safe that the drinks will necessarily be any good.