ᐅ Is it worthwhile to lower the heat pump temperature at night?

Is it advisable to lower the heat pump temperature by 2 degrees between 10 PM and 5 AM (Monday to Friday) and between 11 PM and 8 AM (Saturday/Sunday)?

In my opinion, no, because a heat pump is extremely slow to reach the required temperatures.
In our case, the heat pump runs continuously, and I only lower the temperature setting if I leave the house for several days.

It doesn’t make sense to lower the temperature at 5 a.m. when it’s usually still very cold, as the heat pump then has to work harder again, which is rather counterproductive. If you do want to reduce the temperature at night, it’s better to do so until around 9 a.m., but in the end, it probably doesn’t make much difference.

Night setback is a relic from the past and is generally ineffective with modern low-temperature heating systems.

So, I’ve been thinking about this over the past few days: lowering the room temperature at night is actually not really feasible or practical, but currently, for example, it’s a few degrees cooler at night than during the day. As a result, the flow temperature would be higher at night. This means the pump has to work harder during the night. A nighttime setback could help counteract this. What are your thoughts?

So, there are apparently some people who do this with air-to-water heat pumps. They run a slightly higher flow temperature during the day and use the building's thermal mass as a heat storage. Sometimes this is deliberately timed to coincide with periods when the photovoltaic system is potentially generating power.

However, I cannot judge whether this actually leads to savings. If you want to know for sure, you probably have to conduct a trial run yourself.