Window rebate ventilation or controlled supply and exhaust ventilation?

About 600 gas per year

Yes, that sounds schizophrenic. But you have to do something so as not to become moldy. And there are very divided opinions about ventilation systems. With shock ventilation, warm air also escapes.

no, there is no divided opinion on that. Or is there really someone crazy somewhere who says something bad about a central controlled residential ventilation system with heat recovery?

or is there really some crazy person somewhere who says something bad about a centrally controlled residential ventilation system with heat recovery?

There is not only one, you even know him. Here he writes: and - me again, as expected

Probably only the cost factor was meant. How much does a window rebate ventilation cost per window? [ZWRL] with heat recovery are around... 10-12K€?

Nothing at all. Was standard.

Probably only the cost factor was meant. How much does a window rebate ventilation cost per window?

What extra cost should there be for leaky windows? In old buildings: "the windows are leaky and should be replaced" "oh nonsense, that's state-of-the-art window rebate ventilation technology" Edit: I'll add that this is mainly irony, before the first ones here experience hyperventilation and cardiac arrest again.