[pepoluan]

What's "correct" for you might not be "correct" for others. Furthermore, your owb definition of "correct" changes depending on circumstances; sometimes you want it hotter, sometimes you want it colder. Sometimes you want to change it partway through.

How do you calculate for that?

Back in the 90s, Fuzzy Logic was thought to be the solution. In a way, yes, but only for niche/specialized purposes, and they still have to limit the variables being evaluated.

[roncesvalles]

How about it uses temp sensors to read your skin temp (if that's the variable that matters, idk), and some mechanism for "feedback" after an initial guess? It's all implementation details.