ᐅ Centralized mechanical ventilation with heat recovery: Are individual rooms controllable?

Hello community,
while researching central systems for controlled residential ventilation (controlled ventilation) with heat recovery (heat recovery), I noticed something: nobody seems to build systems where the ventilation of individual rooms can be comfortably adjusted on an ongoing basis (not just once for balancing but continuously, daily). I can neither find testimonials nor see such systems being advertised.

Why do I want this? – A central controlled ventilation system with heat recovery equalizes the temperature of all connected rooms over time. (Air is extracted from all rooms, mixed, passed through the heat exchanger; warmed fresh air reaches every room.) However, this is not always desirable. At night, I want to sleep in a cold room but still use controlled ventilation to be able to sleep with windows and doors closed. The living room, heated by underfloor heating, I do not want or need to cool down every evening. If I could turn off the ventilation in the living room at night and in the bedroom at least temporarily during the day, the problem would be solved.

Would this be difficult? – Air dampers in all pipes from the central manifold to the rooms, controlled by very expensive actuators or simple, inexpensive servos from the model building sector, could regulate the airflow. Sound attenuators would probably be needed behind them (?). Between the fan and the first central manifold, a pressure sensor could be installed to control the fan continuously. If the air pressure before the control dampers is kept constant, adjusting one damper should not significantly affect the airflow through another.

As I see it, this would be a huge advantage with reasonable extra effort. Why does nobody do this? I am still quite a beginner in this field. Have I overlooked something?
Thanks!

The whole process involves significant effort, which means high costs.
How "cold" does your bedroom need to be? Since the entire house is ventilated and there is also air exchange through the doors (or door frames, depending on your preference), the temperature throughout the house will naturally balance out over time.
What you can easily do—without modifying the system—is, for example, to set a timer program. For instance, you could turn the system off between 11 and 12 p.m. (23-24 hours) to have the option of falling asleep in a cooler bedroom—just make sure to open the windows beforehand.

The heat distribution through the ventilation system is only a small part of the issue. Heat also transfers through the walls and doors into the bedroom, unless these are insulated. Therefore, the benefits might be rather limited considering the effort involved...

Constant current system is the key – then regulators in front of the rooms.

But for the reasons mentioned above, it tends to be rather expensive and impractical.

There are already central mechanical ventilation systems with multi-zone control, where in summer, for example, the bedroom ventilation is brought into the house through a bypass to prevent further heating.

The bypass is overrated – useful yes, but it doesn’t really cool anything down. The walls retain too much heat anyway...

As I said, a lot of money for nothing...