Hi Ringi, could you give any examples of what you mean by this description?
I agree that using direct electric heating - an immersion for DHW or a fan heater or convection heater for the space - is probably the fastest and cheapest way of bringing the temperature up to spec. But may be it’s worth seeing if the heat pump can be persuaded to behave better?
There’s an interesting discussion of why turning off the heating to some rooms may not be effective at Why NOT to ZONE Heat Pumps or Boilers! - HeatGeek