What energy costs do you have (electricity/gas/alternative heat source)?

It's actually more of a "who has the longest game." If we use 200 euros more per year than someone with KFW 40 etc., we have also saved 20 thousand during the construction process because we did not choose KfW 40 standard, no blower door test, no controlled residential ventilation, no air-water heat pump, no PI system, but remained standard. So I already have a 100-year lead. K.

Actually, the initial question is nonsense because nothing here is comparable at all. And from when/if any insulation, controlled residential ventilation, etc. "pays off," I think that is more of an individual question to which even experts cannot give a universal answer. My conclusion after building: the heating system must fit the house and the planning of the heating technology is more important than the insulation. And if you don't want to know anything about all of that, then you take gas and have peace.

The 1500kWh is already really very low, even though 20-21 degrees would already be Siberian gulag for me, but everyone has their own preference on how they like it, what kind of annual performance factor do you have?

The air-water heat pump was planned above average

What makes a planning above average?

1: Year of construction: 2017 - 170m² at 950mNN
2: Energy standard: KFW 55
3: Electricity costs: for domestic hot water, heating and ventilation -> 3500 kWh/year
4: Air-to-water heat pump with controlled residential ventilation & heat recovery
5: Number of consumers in the house: 2 persons - or what are consumers (refrigerator, lamps etc.)

What makes an above-average planning?

We achieve an annual performance factor of 5 with ease, which is well above average and even better than I expected myself. I phrased it this way because it cannot be applied to just any new building. Unfortunately, these are often built carelessly by the general contractors and to the detriment of future occupants and the environment, and the wake-up call comes with the first electricity bill. For the good annual performance factor, we merely followed the standard recommendations that can now be found everywhere: planning underfloor heating for low supply temperatures, no thermostats, no buffer tank, well-conductive floor coverings, etc. And of course, it’s also because we’re not afraid of cold ;-) Above 21°C permanently is too warm for me, except when I’m sitting in the office for a longer time. There it quickly gets warmer on its own due to presence + PC. We can quickly heat the bathroom electrically to any desired temperature for baby/child temporarily. System #2248 in the consumption database.

1: Year of construction
2: Energy standard
3: Electricity costs
4: Gas costs (Alternatively your other heat source e.g. electricity for air-water heat pump, etc.)
5: Number of consumers in the house

1. Angular bungalow 140m² with gable roof, built in 1959
2. Renovated in 2017/18 with U-values: roof 0.17; wall (old) approx. 0.9; windows (Uw) 0.9; floor (old) 1.0; heating gas condensing boiler without solar etc.
3. 2000 kWh/year = 600€
4. 22,000 kWh (from 01.02.2018)
5. 2 adults, 1 child, 22°C living room temperature

In 2019 the basement ceiling will be insulated to a U-value of 0.25 and the north wall might also be improved to a U-value of 0.2 then under 20,000 kWh should also be achievable.
Not bad at all for the wasteful architecture :)