Next time, in SFO, ask about using the "Executive Center" across the hall. The AAngels will gladly give you the code to get in...more PC options there if the one in the A/C proper is full.

Your flight temp wasn't you, & it wasn't just the duvet---I've always found the 767 cabins to be hot, often to the point of having to toss the duvet. There's a couple of too hot vs. too cold threads in the AA forum---IMHO, easier to add layers than remove them.

Good luck on your next one!