Heat pump & central residential ventilation

Our controlled residential ventilation system is connected to the heat pump. It reduces the cold airflow but whether you notice it in other houses, no idea, I only know it this way. However, the controlled residential ventilation system is a custom design from Schwörerhaus, presumably just modified from a larger manufacturer.

If you can also cool with a heat pump, why then get an air conditioner? That means double costs, purchase, installation, electricity, maintenance and repair.

We have both. Air-to-water heat pump + controlled residential ventilation (integrated device), and are additionally getting an air conditioner in 2 rooms and a split unit for the entire upper floor.
I did a lot of research beforehand about the cooling function of heat pump + underfloor heating in summer. Most people say you can cool down by a maximum of 1-2°C. And cold air does not rise, unlike heat.

Whether an air-to-water heat pump + controlled residential ventilation makes economic sense I cannot yet finally assess. Functionally it has already made sense for us.

Whether an air-to-water heat pump + controlled residential ventilation system makes economic sense or not, I cannot yet conclusively assess.

Well, maybe it can be explained like this. Air-to-water heat pump + controlled residential ventilation with the intention to cool is like watering a football field with a watering can. Sure, it is possible and somehow makes sense — you save yourself the water pipes and sprinklers and the amount of water will also be lower because you simply can’t deliver the quantities in time like with an irrigation system. So, everything basically sounds great, right? Lower investment, lower operating costs, and somehow the grass still turns green, right? Sounds like an economical system. But precisely because you can’t supply the necessary quantities of water, a nice carpet of lawn will sooner or later become a patchy meadow. Watering a strawberry bed with a watering can, on the other hand, is completely fine and makes sense. The same applies here, because the necessary air volumes cannot be achieved due to design-related limitations, it is a drop in the ocean.

Functionally, it made sense to us.

More than a somewhat smarter control of the systems (single-family house) so that they work together a bit better and don’t work against each other is usually not necessary/possible.

I found the coordinated interaction particularly worth mentioning. Whether this is really advantageous in practice we probably can never assess, since we only get this system and have no comparison. But purely from a logical standpoint, it makes sense that the controlled residential ventilation with 90% heat recovery somehow works reasonably well together with my air-to-water heat pump.

We planned the air conditioning separately exactly for the reasons you mentioned, meaning we do not intend to cool with the air-to-water heat pump/controlled residential ventilation. We hang split units in the rooms.

We’ll install split units in the rooms.

However, these should also be able to properly communicate with the controlled residential ventilation system and the air-to-water heat pump. If so, then really properly.

If pipes are installed in ceilings, Bpl, concrete walls, i.e. BKA, it works fine to cool with an air-water heat pump. The climate is managed by the controlled residential ventilation. Underfloor heating with an air-water heat pump for cooling is better than nothing, but not much more.