Set controlled residential ventilation KFW 70 with underfloor heating

One must also consider, the house was built in August.

Exactly, that's why you should dry heat it nicely, just don't be stingy.

No, it should be warm ... But what doesn't have to be, doesn't have to be. Not really great for throwing out either, unfortunately

In general, where underfloor heating is installed, a night setback in the classic sense does not make sense, because the floor serves as a heat storage and therefore the "night" does not cool down anyway but only becomes cool towards the morning, then the heating has to reheat and warm up the sluggish heat storage (floor)... If you want to do it, you should already lower the temperature early in the evening so that it cools down towards bedtime and then also start reheating earlier again so that it is warm enough when getting up. Of course, this can also be handled differently on working days and weekends, meaning, for example, that there is no one in the house during the day on weekdays in our case, so it only needs to be warm by late afternoon...

But as you already said, new buildings do not cool down so quickly anyway.

How it is in connection with radiators is certainly a different matter.

That it doesn't help because of inertia and the storage compared to panel radiators is obvious.

But especially when no one is home all day anyway and the windows are well insulated, I think it is more economical than having it running continuously.

But I will do the test when I am home for a day.

So, today our stove is coming, I'm curious. It is a storage stove that is intended to be used for support and visually.

I actually do not plan to change anything on the heating control, otherwise it will be a hassle on the days when the stove is off. We are then hoping for savings by turning off the thermostats when the warm air flows through the whole house.

Let's wait and see ...

In December, we used 100m³ for heating. The ground floor was completely heated to 21-22°C. The upper floor was unheated except for the bathroom, but the rooms still remained around ~20°C. Overall, since moving in on February 15th last year, we have used 480m³ of gas.