Thanks for raising the privacy issue @MyForest, it’s a tricky one. Do you think the privacy concerns are at all reduced for heat pump data relative to solar PV/electricity consumption, or pretty much exactly the same? Occupancy is (or can be) less directly obvious if heating is on fairly continuously, although it’s still clear when you’re having a two week holiday.
Different people will have different comfort levels of course but a platform would need to either offer different options or have some (probably relatively conservative) policy.
@TrystanLea’s profile explorer potentially gets around this, but that may also indicate if you are always out at a certain time of day!