There can be various reasons because the Havenwise optimisation continuously tries to reduce your energy bills. If you think none of the below scenarios applied in your case, please let us know.
Havenwise is preparing for your next setpoint
If you have a setpoint programmed in a few hours from now, Havenwise will start pre-heating the house in advance to gradually lift the temperature to meet your future setpoint.
Havenwise is making use of cheap electricity because you’re on a time of use tariff
If you have a time of use tariff with cheaper and more expensive periods through the day, Havenwise will by default take these into account to optimise the operation of the heat pump.
Mathematically, it is almost always the cheapest thing to do. If you have electricity that is 3x cheaper now than in 2 hours from now, the heat pump can be 3x less efficient and still break even!
If you want to disable this feature for your heat pump (for instance because you have large batteries), please write to us to switch you to "Mode 2". Learn more about the various modes here.
Havenwise is maintaining your optimal setback
In between 2 setpoints, Havenwise will calculate the optimal setback. That means it will calculate how far it can let the temperature drop before it needs to start ramping up again.
Very often, the optimal setback from a cost perspective is not much below your target temperatures (for instance only 1°C lower or even less). So the heat pump will ramp down a lot to let the room temperature decline gradually, but might not be fully off.
This is an advanced feature of Havenwise, and means it will be cheaper for you. Turning the heat pump off and ramping it up more aggressively just ahead of your setpoint would be more expensive.
A sudden drop in temperature was registered
Sometimes a sudden drop in indoor temperature is picked up by Havenwise. That’s typically because a door or window opened.
Havenwise always aims to meet your targets in the Havenwise app, so it will ramp up the heat pump to bring the house back up to temperature.