Is KFW 40+ also possible with a decentralized ventilation system?

Good morning,

I have a question that I couldn’t find a clear answer to on the internet. Maybe someone here knows for sure. Is a central ventilation system mandatory for a Kfw 40+ residential unit (it is supposed to be a multi-family house), or is a decentralized ventilation system with heat recovery also acceptable?

I think a decentralized system should also be possible, since the KFW apparently only requires a ventilation system with at least 80% heat recovery. And some decentralized systems can also meet this requirement.
However, in some places I have also read that a central system is absolutely necessary.
Maybe you can tell me more about this. Thanks a lot in advance

Regards
Specki

You can also have up to x euros of the consulting fees reimbursed.

That doesn't really help me now....
However it was meant.

Decentralized is probably more sensible for the apartment than centralized. Both are possible. Whether it can be done entirely without must be calculated. To my knowledge, it is not explicitly required, but I would assume that substitute measures like more insulation are more expensive and less sensible.

Two quotes from the KFW page:

[*]A KfW Efficiency House 100 corresponds, for example, to the requirements of the Energy Saving Ordinance.
[*]A KfW Efficiency House 55 requires 55% of the energy of the reference building, a KfW Efficiency House 40 even only 40%.
[*]For the standard KfW Efficiency House 40 Plus, you need additional devices and systems, for example for power generation and ventilation.
[*]

These are the Plus components in detail:

• a power-generating system based on renewable energies on the property. Mostly photovoltaic is used or a combined heat and power system, rarely wind power,

• a stationary battery as an electricity storage,

• a ventilation system with heat recovery,

• a digital user interface that visualizes power generation and power consumption.

On the KFW page, however, I cannot find any statement whether decentralized or centralized. And on the internet, I find contradictory information.

Controlled residential ventilation is not an add-on component, even if it may be stated that way by the KfW itself and you might practically not be able to avoid it. Centralized is not mandatory. You must achieve certain values for KfW 40 (without +) and the path to get there is not strictly prescribed, even if the KfW examples may look like that. You will not be able to avoid a calculation.