The options aren't ≥37° xor =18°. Setpoints are ubiquitous and timers very common, too. They nearly got somewhere when talking about cooling different rooms by different amounts!

I don't do sports but assuming the muscle heat requirement is a thing, how does anyone exercise or do heavy work outside in countries where the temperature falls to 18° some days of the year? Presumably one could use a jacket? And how do the office workers manage in 18° air? I'm a dude and I'd still freeze my nipples off when doing desk work when you can cook eggs outside and I came in a t-shirt. There's so much here that isn't explored and then the story ends open-ended. It doesn't seem useful even as an n=1 anecdote