> House heating tends to have controls from thermostats or other devices; I'd tend to look to them for grid-related time-shifting Not for heat pumps. In a typi

> House heating tends to have controls from thermostats or other devices; I'd tend to look to them for grid-related time-shifting Not for heat pumps. In a typical configuration (large heat reservoirs combined with under-floor heating in a well-insulated house), temperature-setpoint changes take 12-24 hours to propagate. So, governing the (in-room) target temperature settings is unreliable/unpredictable. Whereas the in-pump storage temperature is a whole lot more manageable. The old advice "turn your thermostat down at night" therefore also doesn't apply to most heat pump installations -- in fact, it might be disadvantageous. "Select the average temperature you need and don't touch it" is much better advice. Need localized heat/cold? Use another solution for that...