House construction, KFW70, approx. 150m², which heating? Gas/air-water heat pump?

Clean ... and what happens during the extraction of the gas?

That could also be a question for the electricity used by the heat pump.

We are getting an air-to-water heat pump. Manufacturer from Austria. The heating is supported by a photovoltaic system. In our opinion, you can be more independent with the heat pump, and also retrofit it later if it is too expensive at the beginning. But yes, it depends on the heating load of the house and the area. We have a central ventilation system with heat recovery. Friends of my mother already installed one sometime in the early 2000s and have no hygienic problems at all. No ventilation is, in my opinion, not a solution. With airtight houses, you would have to air out vigorously 4 times a day. And hand on heart, who does that or would be able to manage that in terms of time?

With the evil pipe, do you mean visible pipelines? And what exactly is meant by "do you live loud"? Whether I am loud, meaning inside the house, or whether it is loud outside =)? And is loud for you the city? Or like it will be in our village, the small federal road 200m away that sometimes disturbs traffic during rush hour?

I will post the wall constructions and insulation setups in the appropriate forum (if I find it), I would be interested to know whether that is "standard" or more of a lower level. Or what could possibly be improved without having to pay several thousand more again.

Do you live next to a street - decentralized systems reduce (somewhat) the sound insulation value of your wall (after all, there is now a hole in it) Yes exactly - the embedded pipes that are hard to reach.

By the evil pipe, do you mean visible piping? And what exactly is meant by "living loud"? Whether I am loud inside the house or if it is loud outside =)? And is loud for you the city? Or how it will be in our village, the small federal road 200m further that sometimes disturbs during rush hour?

Central ventilation systems have a pipe network for supply and exhaust air, usually these pipes run in the ceiling or walls to every room and from the central control (basement/technical room) via installation shafts to the roof. There the supply air is drawn in and the exhaust air is released; somewhere in between is the heat exchanger. Some people think that these pipes eventually get dirty and throw germs into the rooms, which long-term experience has not confirmed so far, since the supply air is filtered and the exhaust air goes outside anyway. That is why BeHaElJa spoke of the "evil pipe". Decentralized systems have direct wall penetrations on the exterior wall and regulate each room separately. Hence also the question about the appearance and the noise level. Decentralized systems are louder and/or transmit the noise into the house.

Decentralized systems are louder or transmit the noises into the house.

No, not all

Rhenish greetings from the road