Building a single-family house in NRW

To the moderation,
maybe you could outsource the Controlled Residential Ventilation topic, it does not help Judith82 here IMHO.

Big "Like".

The Controlled Residential Ventilation subdiscussion in this thread far exceeds the extent for which I would otherwise be accused of "waffling". *Irony_mode_on* Respect! *Irony_mode_off*

the difference is that here several people babble over several pages, whereas you prefer lengthy monologues

Yes, that may be, brevity is probably not my strength

Nevertheless, I noticed: this is now the hundredth post (including three from me) but only five from the questioner, who only mentioned the controlled residential ventilation in passing. However, this partial aspect is now spread over sixteen of seventeen pages. I was not against this exchange of opinions at all, even if it is generously proportioned (I would openly be one of the last to complain about that). Rather, I was in favor of the proposal to separate off this sub-discussion.

Big "Like".

The controlled residential ventilation subdiscussion in this thread far exceeds the extent for which I would otherwise be accused of "babbling." *Irony_mode_on* Much respect! *Irony_mode_off*

Yes, why turn on the irony mode? One would think that you want to gain something here through quantitative hard work

Best regards in brief

You:

who only mentioned the controlled residential ventilation in passing.

The OP:

The 2 developers have roughly the same concept, but their prices differ greatly. One says you don’t need a supply and exhaust ventilation system in a KFW 55 solid house, the other says it is very important. Completely unsettled.

So what? Just like their 2 companies, this question is very controversial.

The OP’s other question was:

With TaC we are within budget, but there are mixed opinions about the company. Anyone with experience in the NRW area?

That can only be answered sensibly in the moderated area or by private messages anyway.

And with us, the controlled residential ventilation has made solar domestic hot water heating unnecessary anyway. So about 5,000 EUR saved here (otherwise at least 3 collectors would be necessary for us).

How can controlled residential ventilation save on heating domestic hot water? The water you need for showering is not heated by that.