Semi-detached house with decentralized residential ventilation and heat recovery

Hello everyone,

we would like to buy a semi-detached house, fully basement, ground floor, upper floor, converted attic studio. The developer plans a decentralized residential ventilation system with heat recovery, a total of 4 units, which, however, will only be installed on the ground floor and upper floor. The attic studio is planned with a shower bathroom and we would also like to set up our bedroom there.

Upon inquiry, of course, a central HRV could also be installed. However, we were told that this would cost about €13,000 extra. That seems a bit exaggerated to me, since the approximately €4,500 for the decentralized solution is not deducted here, but actually total costs of €17,500 would arise.

What do you think? Do you have any experiences on how to convince developers to use a central HRV that does not exceed the budget?

Thanks already for your feedback!

Do you really want a central control? Everyone must then run at the same level, no individual adjustments.

at least that is what I understand by central WRL

By central ventilation I understand that the device itself is located in a central place (e.g. basement) and ventilates the entire house through ducts/pipes (by the way, 150 sqm). In the planned decentralized ventilation, for example, no device is planned in the attic.