ᐅ Optimizing the Floor Plan of a Detached Single-Family Home, 155 sqm

Arauki11 schrieb:

What exactly is the price difference between heat pump systems including mechanical ventilation with heat recovery?
And what would be the cost for a completely separate mechanical ventilation system?
Would pre-installation be accepted? It’s not that much, is it?
You should also answer questions; otherwise it will get even more complicated.
Are you forgetting the ground floor?

Air-to-water heat pump without mechanical ventilation with heat recovery: approx. €32,000
Air-to-water heat pump with integrated mechanical ventilation with heat recovery: approx. €21,000 surcharge
Air-to-water heat pump with separate mechanical ventilation with heat recovery: approx. €28,000 surcharge

All prices naturally include complete installation with underfloor heating, etc.

For the offer with separate mechanical ventilation, a more expensive air-to-water heat pump was selected (larger water storage tank).

I haven’t been able to respond to the offer yet, as it only arrived on Friday.

Therefore, I’m also not sure if I could just provide the piping.

JoschNeubau24 schrieb:

Air-to-water heat pump without controlled mechanical ventilation: approx. €32,000
Air-to-water heat pump with integrated controlled mechanical ventilation: approx. €21,000 additional cost
Air-to-water heat pump with separate controlled mechanical ventilation: approx. €28,000 additional cost

Ok, thanks.
That’s quite striking, €21,000 extra for the integrated controlled mechanical ventilation. I would really like to understand why. As a layperson, I can’t explain why a more expensive air-to-water heat pump is needed with separate controlled mechanical ventilation – I don’t have one myself.

JoschNeubau24 schrieb:

I’m also not sure if I could just have pipes installed in advance.

You can only find that out with the company you’ve hired.
I don’t know if you are allowed on site, but I could have worked there for weeks unnoticed, and it was agreed upon anyway. Apparently, some contracts prohibit that. Maybe you can still negotiate something so that you could install a system like Zehnder later, as long as it doesn’t interfere with construction. That also depends on your building method and where the pipes would need to be located.
Before doing nothing at all, I would at least consider a decentralized ventilation system.
I would go there first thing Monday and discuss in person so they can offer you a solution agreeable to both sides and install your desired controlled mechanical ventilation system.
Just ask about the possibility and price for a Zehnder Comfoair Q350 independent from the other technology.

JoschNeubau24 schrieb:

Of course, we can keep the heat pump without the ventilation system. We only inquired about a ventilation system and received the corresponding quote due to feedback from the forum.
Regarding the handover date: the funding approval came completely unexpectedly (application was in March 2024). Both the developer and we expected it to happen later. That’s why we haven’t been in a hurry to make a final decision yet.

When you suddenly mentioned the handover date being in just five weeks, I initially felt mocked that you only asked us so late and are still calmly discussing things that, for an orderly production process, require what feels like an eternity of lead time (including a “plop means stop” freeze on changes). Also, I cannot imagine that a non-developer building on your lot would disrupt the schedules of several other customers and put their team in a time machine to have already produced your walls and ceilings on loading pallets in the past. In the reality I know, this does not work. Heat pumps alone are allocated (by the central committee or Eurotransplant—who knows which gods are responsible?) depending on when an available installer has the time. And now I’m supposed to believe that you just whistle “the money is there” and the low-loader drivers hook up immediately?

I still haven’t received an answer to my inquiry about who, when, and how decided that a much more expensive system configuration a) would be, as the former chancellor would nicely put it, “without alternative,” but b) at the same time also simply removable, while c) it can’t be installed with a bypass for parts that will only be delivered later and which you d) would only maybe put into operation at some point in the future. Removing that equipment entirely from the order sheet is your right, but you say adding a provision for an on-site later order is denied. So far, you have come across as an authentic homeowner whose spouse has a bay window wish—but now I feel more like I’m being trolled. Before I “pay ransom” here in the form of more advice, I’m inclined to first ask for some sign of life that you’re real (in the past, this would have been appropriately ended with an emoticon).

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Arauki11 schrieb:

Okay, thanks.
That’s quite something—an extra charge of €21,000 for the integrated mechanical ventilation with heat recovery. I’d really have to get an explanation for that. As a layperson, I don’t understand why a separate mechanical ventilation system requires a more expensive air-to-water heat pump; I don’t have something like that.

You’ll have to find that out yourself with the company you hired.
I don’t know if you’re allowed on the construction site, but I could have worked for weeks without anyone noticing, and it was agreed beforehand anyway. Apparently, some contracts exclude that. Maybe you can still negotiate something, like retrofitting a system such as the Zehnder if it doesn’t interfere with construction. That also depends on your building method and where the pipes would have to go.
Before doing nothing at all, I would at least consider a decentralized ventilation system.
I would go there in person on Monday to clarify that they offer you, as a customer, a mutually agreeable solution to install your desired mechanical ventilation system.
Just ask about the possibility and price for a Zehnder Comfoair Q350 that is completely independent of other systems.

I had the ducts installed (done at no extra cost) and ordered the Q350.

I’m very interested to hear how you implemented it and how satisfied you are with it.

I planned the unit in the attic and used ComfoTube 90 pipes to supply each room—or in the case of the bedroom and upstairs bathroom, for example, two vents—and the living area has three supply air and two exhaust air vents. The total length of pipe is about 100 meters (330 feet).