Extremely dry air due to ventilation heating - what can we do?

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My very personal opinion on this topic is therefore:
Either a passive house (which, according to a full cost calculation, is cheaper after just a few years and significantly more environmentally friendly) or underfloor heating with an air-to-water heat pump (or ground-to-water heat pump in very cold areas).

I plan to build a KfW40+ house, which is very close to a passive house, and I am wondering whether one should take the risk of this technology, which is difficult to change later. The Proxon pumps are designed for that... So in this case, would you also not recommend/choose underfloor heating?

Our house is significantly better than KfW40... but still worse than passive. Of course, the providers try to sugarcoat it because they are cheaper with LLWP (not because the heating is cheaper, but because the ventilation is then omitted). Discuss this with your energy consultant.

I believe has a passive house and can say something about that or about the preferred heating system.

Who nowadays still ei

I was recently at a consultation in a show house with an air-to-air heat pump and despite wearing contact lenses I had no dry eyes

You were probably there for 1 or 2 hours. I think it is wrong to draw any conclusions from that. Besides, you don’t know if there was any humidifier in the corner or a system with moisture recovery. The fact is that many people have problems with dry air in winter.

So in this case, you wouldn’t recommend/choose underfloor heating either?

Yes. KfW40 with underfloor heating and air-to-water heat pump.
Or basically passive at almost the same price, if you find someone to build it for you. And then just without a real heating system.

Both need a central ventilation system.

(not because the heating is cheaper, but because the ventilation is omitted)

No. The water part in the floor is omitted. Both have ventilation.

No. The water section in the ground does not apply. Both have ventilation.

Oh, I confused myself because with an air-water heat pump you also need controlled residential ventilation... but of course you are right.