Temperatures are so hard! I'm the other way around: I overheat easily, and at anything over about 75F, my brain stops working well (which is a bad combo for either teaching or ritual.)

I try to keep things around 70 in the winter (which means I turn the heat on only intermittently), and a little higher in summer, but the AC is in the bedroom. Along with a Vornado fan, because I'm very sensitive to lack of air movement.

(The bedroom is probably the better ritual space, but one can turn off the AC and fan in that case.)