ᐅ Question about daily living with a mechanical ventilation system with heat recovery

Mycraft schrieb:
If you want to sleep with the window open, then you have to turn off the system.

You don’t have to do anything!
Running the mechanical ventilation system and opening the window works.
In winter, the cold air comes in through the open window, and heat energy escapes. This is something to keep in mind, and eventually, you won’t need the window ventilation anymore because the ventilation system supplies fresh air too—it just doesn’t come through the window but through the wall.
If you still prefer to open the window, then you should keep the bedroom door closed to prevent the thermostats from reacting unpredictably and heating more to compensate for the cold air at the window.

Is ventilation mandatory with the minimum standard of the 2016 Energy Saving Ordinance, or only starting from KfW 55?

ypg schrieb:
You don’t have to do anything!
Running a mechanical ventilation system and opening windows works fine

However, it is not advisable because it increases the wear and tear of the system. When doors and windows are closed, the system remains balanced.

As soon as a window is opened, the balance is disturbed, and the system tries to compensate by continuously adjusting the fan speed up and down...

Mycraft schrieb:
Yes, but you shouldn’t do that because it increases wear and tear on the system. When doors and windows are closed, the system is balanced.

As soon as a window is open, the balance is disturbed, and the system tries to compensate by constantly adjusting the fan speed up and down...

I just want to ease the concerns about a controlled mechanical ventilation system.
Once you have it, it’s actually quite comfortable...

We also turn it off when needed. But that’s rare.

Steffen80 schrieb:
After that, just ventilate… done. No mold so far, even though water sometimes really runs down my walls

Well then, good luck.
In a KFW40+ house or even better without mechanical ventilation with heat recovery.
My advice: Get well informed about this topic first before you compare a new build in the KFW40+ category with your current old house.
Where your moisture still somehow escapes in your "old beat-up place," it will hardly do so anymore or only very poorly in the planned building.
Your window ventilation approach completely contradicts your efficiency goals. Especially in winter and transitional seasons.

You are an engineer. So, a smart person! In another thread here, you talk about heat contributions from refrigerators in a passive house, saving a heat pump, and direct electric heating… and then wanting to ventilate by opening windows. Yes, great. But to me, that does not add up. You're planning to build something that will not work, at least not as you expect.

Well, it’s your house. You will have to deal with any later problems from not having mechanical ventilation with heat recovery. I’m saying this – unusually for me – bluntly and harshly.
Best regards,
Thorsten

He is quoting someone else!

Regarding mechanical ventilation and large window fronts.

Do you lower the shutters every time? In my case, the tiles heat up so much that by midday I already have 25-26°C (77-79°F) on the ground floor.