Heat pump consumption 2019 on a monthly basis

Yes oil, yes old building. Efficient? I don't care.

That is really an incredibly sad attitude nowadays. Nothing against old buildings and oil where it makes sense, but the rest of the sentence... Oh man.

Comfort and efficiency are not mutually exclusive. A well-designed new building is (significantly) better in both.

The house has only belonged to us since 1.11. and we have not moved in yet, so I do not have any personal values yet. I received an invoice for 2017 from the previous owner; there is no more recent one. He used 13,500 kWh for heating in one year. At the end of 2018, a local heating engineer performed a hydraulic balancing, and I received the invoice for that. Maybe that already had some effect. It is often said that you should not do individual room control. We have a box in the wall on each floor that has a valve for each room, like they used to have on radiators. Should I then turn all of them fully open and regulate the heating accordingly? Due to renovation stress, I have not had much time to read the manual. If I am correct, the heating system is a LA17TU from Dimplex, and there is a Hydrotower HWK 332 Econ with heat pump manager in the basement.

The house has only belonged to us since 1.11. and we have not moved in yet,

Move in first and then you have 2020 and 2021 to optimize. It takes that long to adjust the heating so that it fits all seasons. In the first year, you optimize gradually and in the second year, you check if your settings are okay and make a fine adjustment if necessary.

If renovation work is still pending before moving in, one could possibly also consider the heating surfaces. Google it as described by Lumpi. There is a lot of competent help available.

13500 is of course a big number, but not entirely unreasonable. If nothing in the house has been energetically renovated, 200kWh/m²*a is a realistic value. That makes 200kWh/m²*a x 200m² x 1a = 40000 kWh. Annual performance factor = 40000/13500 = 3.0 <- not unrealistic for an uninsulated old building.

We are renovating a bit but not taking up the floor etc., so there will be no changes to the heating circuits. I will insulate the top floor ceiling soon, as so far only some vague bit of rock wool has been stuffed into the intermediate ceiling.