Optimal prefabricated house heating: air-to-air heat pump / air-to-water heat pump?

Hello everyone,
we would like to build next year and are currently trying to find out which house would be right for us. Whether a solid house or a prefabricated house is still not decided (although I fear that the solid house will fail due to the budget).

So far, we have been advised by 2 major prefabricated house providers and one topic that surprised me a bit is the heating / ventilation.

Due to the airtight construction of the houses, controlled residential ventilation is now apparently indispensable, which I can somehow understand.
According to a consultant, about 95% of newly built single-family homes are now heated with heat pumps, which surprised me a bit, but I had never dealt with this in detail before.
I have already googled a bit about these systems but while some are completely satisfied with them, others deeply regret having decided on them because they are either cold in winter or have very high electricity consumption.

My concerns are as follows:
- Higher electricity consumption than projected
- Development of electricity prices in the coming years
- With air-to-air heat pumps, you are limited to this system; a later conversion to another energy source seems very complex
- With air-to-water heat pumps with underfloor heating, in the worst case you could later couple the underfloor heating with another heat source.

Is it really the case that with the current insulation standards the heat pump is the best solution for a prefabricated house?
In our conversations, the consultants hardly addressed other energy forms such as gas, pellets, or wood, even on request, which somehow makes sense since these would probably produce too much energy, right?
Are there still providers who build prefabricated houses without controlled residential ventilation and with conventional underfloor heating at all?

Thank you very much in advance for your help.

(although I fear that the solid house will fail due to the budget).

That is a misconception - often, solidly built houses by the regional general contractor are considerably cheaper than prefab houses. At least that was the case for us.

With that, you will also be able to realize such "special requests" without any problems.

Prefabricated houses are not cheaper. If you build with HUF or Kampa, you are upper class, and almost every solid house is cheaper. Even Scanhaus Marlow Marlow is not necessarily cheaper than Town & Country.

LWWP is great in a modern, well-insulated and designed new building. LLWP is for passive houses and can safely be called "nonsense".

In a newly built old building (Energy Saving Ordinance), you will not be happy with LWWP.

Electricity is already near the maximum of taxation. If a CO2 tax ever comes on gas, cheap gas will be over.

In a newly built old building (Energy Saving Ordinance) you will not be happy with an air-water heat pump.

Hello fragg,
why will I not be happy with a ground source heat pump in a newly built Energy Saving Ordinance building?

Regards,
dropss

He means an air-to-water heat pump, but I don't understand why either. They only built according to the [Energieeinsparverordnung] with an air-to-water heat pump, it heats the whole house in winter, the water is warm all year round, and the electricity costs are reasonable too.

Ah ok, thanks. My mistake.