Controlled residential ventilation: How do I find the right provider/the right system?

We are renovating an old building and adding an extension in the coming months. We are currently also considering a controlled residential ventilation system. A friend recommended Paul Lüftung to me... I have hardly any knowledge about the subject. I have only read a little about central and decentralized systems, briefly dealt with enthalpy exchangers, and read something about heat recovery pumps. How should I best approach the matter now? I have no other acquaintances who recently installed such a system. Maybe a few key data: about 180 sqm (basement available, should not be included, attic actually not either since it is not initially planned as living space, for example the controlled residential ventilation system could be installed there) open fireplace available (I have to talk to the chimney sweep about this, controlled residential ventilation and fireplaces are rather difficult) What rough costs do I have to plan for? (what range?)

Hello Mattes82,

does "we are renovating" mean that you want to do everything yourselves? Then good luck! Otherwise, at this point I would simply recommend a TGA planner who can competently advise you on exactly this topic - manufacturer-independent. Furthermore: I would generally follow the installer’s advice, because only what he knows can he also (well) take care of.

Best regards

K1300S