Sole-water heat pump only with decentralized ventilation system?

Good evening,

Our general contractor only offers us the geothermal heat pump with decentralized supply air and centralized exhaust air.

Is it really not possible any other way, or does he just want to sell us exactly that?
We actually do not want decentralized supply air, because then you have those fans in the wall everywhere, we just don't like that.

Thanks in advance.

He wants to make fools out of you. The heating system can be combined with any ventilation.

Thank you for the quick response, then we will seek the conversation again. What do you generally think of decentralized air supply?

Maybe he simply doesn’t have a company in his portfolio that installs central systems and just doesn’t want to bring in more experience. Because it also works with decentralized systems. So why "get your hands dirty" and have more work than necessary. Decentralized, yes, as a retrofit, okay. Better than no ventilation at all. In new construction, it often causes more problems than it solves.

Is it really not possible otherwise or does he just want to sell us exactly that?

Yes, it is possible otherwise and yes, he wants to sell HIS product. Maybe because he likes a special combination device and does not want to deal with other devices.
As long as you do not buy a combined heat pump (whether air, geothermal, or whatever), you can install whatever you want. Heating and ventilation are then separate.

Like when buying a suit. Either a ready-made combo = jacket and pants from one manufacturer. Or as a combination - jacket from Boss and pants from H&M or C&A or mixed however.

Please also address the topic of humidity. Although we have a very high-quality and new system, it is a disaster (it is also properly set and everything). Fortunately, we are now building new, and that would be the last thing I would want again.