I am guessing in many cases, there is no money left for humidifiers. You start out with the idea that you want to build a passivhaus. But you still have a limi

I am guessing in many cases, there is no money left for humidifiers. You start out with the idea that you want to build a passivhaus. But you still have a limit on how much you can spend. So all the ventilation stuff is being installed, and the humidity control is being skipped. Which leads to each and every individual apartment considering their own humidifier, which probably pretty much kills the energy-efficientcy-idea that started the whole thing. At least that is what I observed in my limited small world. Humidity below 30% is cruelty.