Prefab house made of Neopor - experiences?

There are different points. 1. The woman wants a fireplace in the living room. If it were up to me, it wouldn't be necessary. 2. Many friends have now built according to current standards and despite automatic shading, etc., it simply gets very warm in the summer, so it was clear to us that an air conditioner would definitely be installed. If you can then easily add heating in winter, even better. And controlled residential ventilation requires preheating or cooling. 3. Domestic hot water via tube collectors including pool heating speaks for itself, I think. 4. A wind turbine is much more efficient than solar. Because it is not dependent on the position of the sun, but on wind conditions—such as speed on and off flow—especially since where a lot of energy is needed, there is usually a lot of wind available. And ultimately it is wear-free, or the few moving parts can be simply replaced after 20 years. The points are given. Thus, it is an easy calculation. At 4 m/s on average, the system would produce about 7000 kWh per year. If you use everything yourself for heating and the electric car, you save about 2000 euros. That would pay for itself after 7.5 years. But I am not counting on that.

4. Wind turbines are significantly more efficient than solar.

Have you already checked what the building regulations say about a wind turbine?

1) A small device with a lot of mass is recommended here, as a comfort factor, not as a primary heating source. 2) If done correctly, it is actually not a problem. As a supplement, it is best to use core cooling, not a bunch of individual devices. 3) No, it does not work or only very ineffectively. 4) Yes, I have no idea about that, but I can hardly imagine it. Is it even allowed to build such things everywhere? Are they as loud as normal wind turbines?

With 4 m/s on average, the system would produce about 7000 kWh per year. If you use everything yourself for heating and an electric car, you would save about 2000 euros. That would pay it off in 7.5 years. But I don't expect that.

If it were really worthwhile and easy, many would do it, so there must be a catch somewhere. On common sites you read about 5000€ per kW peak power. For 7000 kWh you want to save, at 4 m/s you would have to install about 8 kW. That makes a 40000€ investment. You are assuming a 15000€ investment, which is about a 3 kW system. That yields 2400 kWh at 4 m/s. And the 3 kW are at 10 m/s wind. In calm or less wind, that's not enough for an instantaneous water heater or an BEV; then you still need power from the grid.

One might help me, a creaky old man, to get up to speed; I don't quite follow what the passive house discussion of the last pages has to do with building with formwork stone systems: You can insulate until the doctor comes even if behind the ETICS there are porous bricks or sand-lime bricks or any other masonry construction wall material (?)

If it would really be worth it and be easy, many would do it, so something is holding it back. On the common sites you read about 5000€ per kW peak performance. For 7000kWh that you want to save, you would need to install about 8kW at 4m/s. That means a 40000€ investment. You are assuming a 15000€ investment, which is about a 3kW system. At 4m/s that gives a yield of 2400kWh. And the 3kW are at 10m/s wind. At calm or less wind, that is not enough for an instantaneous water heater or an BEV, you would still need power from the grid.

Yes, that's true, I was able to buy a 2-year-old Sonkyo with 7.5kW for 15k already. As a display model. Let's see, I'll wait and be surprised.

The building permit is not approved yet. However, the next house is about 65m away, and it is a village area with a 40dB limit. According to the expert report, the system is about 35dB at 8m/s wind. Extra quiet.

One is located in Immenhausen, North Hesse, you can check on Google Maps. I talked to him, he is very satisfied and you can hardly hear anything.

And cooling via underfloor heating is nothing. You can't cool much, otherwise condensation forms and we would like a real wood floor. You really can't compare that to real air conditioning units.

But true, we are pretty off topic.