One thing I haven't seen discussed in this thread (unless I missed it) is that a persons age has a lot to do with what is considered hot, cold and comfortable. As a kid, living in Virginia, only cold bothered me. Heat was never an issue except when trying to sleep at night with the temps in the upper 90's and the humidity also in the 90's. Those nights were absolutely miserable and there was no air-conditioning back in those days. You just had to suffer through it as best you could.
Now, as I age, I find that I simply am not able to acclimate very well to temps over 85°F in the summer or below 60°F in the winter. I would have to say that my ideal temperature would be between 75 and 78°F.