Controlled living space ventilation with decentralized supply air!?

Hello forum,

My previous equipment plans for my single-family home included a controlled residential ventilation system with heat recovery and central supply and exhaust air.

Now, an installer recommended a different system to me:

Central exhaust with heat recovery via the brine heat pump (but so far I actually want a gas boiler) and decentralized supply air through openings in the roller shutter box.

My concern, however, is that the unheated supply air could be very unpleasant in winter. (Especially in the bedroom)

As advantages of this system, he mentioned the price, no room-to-room noise transmission through the supply air ducts, and hygiene (no contamination of the supply air through duct channels).

I consider the issue of contamination to be nonsense.

How do you see the whole matter? Especially the comfort limitations due to the cold supply air?

Hello,

...My concern, however, is that the unheated supply air could be very unpleasant in winter. (Especially in the bedroom)

The concern is definitely justified. With centrally preheated supply air through heat recovery, the supply air temperature is only a few kelvins below the room air temperature and is hardly noticeable, depending on the planned (required) air volume.
-15°C directly from outside is more likely to be felt ;-)

best regards

A few Kelvin below room air would probably still be desirable - when I think of an otherwise hermetically sealed bedroom, with the heat input from two people and a waterbed.

Only really cold drafts through the decentralized ventilation would then have the "comfort" of a tilted window... and exactly avoiding this was actually one of the reasons in favor of controlled residential ventilation for us.