Controlled residential ventilation + fireplace + kitchen exhaust, does it work?

Ok, sounds doable in itself. I won't have KNX either. So I'm interested in simple alternatives. Then I suppose I'll have to read up on Homematic.

If you haven’t settled on a system yet. Then first take a look at iobroker. There you can integrate almost everything and link it together. Furthermore, it is also possible to create programs within iobroker. Like if, then, else if, etc.

So an extremely powerful tool. Just keep in mind that most of it is radio-based and you should be aware of the disadvantages that come with that.

with us nothing is coupled or anything; everything is analog and low-tech :) we don't want so much technology in the house.. everything then has to be maintained all the time.