Re: I'd love to have smart heating...
"Other days, they’ll feel hot, so they set the thermostat to 16°"
People treat thermostats as a "volume" knob and reason that the further they turn it, the faster the temperature will change. No amount of telling them otherwise will convince 'em.
Under "normal" circumstances it would be a good idea to only allow a 1 degree change per minute, but if it's a knob people will break it and if it's a button they'll smash it.
On the other hand, when my "smart" thermostat is set to 5C (daytime, noone's home normally so the heating's effectively off) and I want to set it to 17C, I don't want to wait 10 minutes to achieve that setting.