How many degrees of heat loss per night is "normal"?

Hello,

in our new building (built in 2016) we currently do not have a heating system but only use the wood stove in the living room (6KW). We then heat after work from 4 p.m. until about 10 p.m. When we go to bed, it is about 21.5 degrees in the house. The stove then goes off.

In the morning we get up at about 17.5 degrees. (Current outside temperature at night about -1/-2 degrees)

Is that normal? - It seems to me like a lot of heat loss. We have about 145m².
If I remember the seller’s words about how long the temperature lasts, etc.

What are your experiences here?

Is it a timber frame construction (prefabricated house)? The screed only gets warm very superficially (or does the stove heat it?) and all the rooms around the living room are also rather unheated (?). Take care of your building fabric...

Air stores very little energy.

Ventilation of living spaces? Normally, this heat loss is too much.

No, we don't have ventilation and the stove is not connected to the heating system. We are already fully furnished. The house is a wooden house made of solid wood.

What does "Passt mal auf eure Bausubstanz auf..." mean? - Well, we are keeping an eye on the humidity. It stays between 48% and 52%. Measured in the living room downstairs and the bedroom upstairs. We thought that was fine.

You heat very selectively and therefore surely have large differences in room temperatures - especially between 10 PM in the living room and 7 AM in the children's room (=a room far away). Don't say it has to be problematic... But it can be under certain circumstances. The difference is indeed high, but still explainable. Do you have underfloor heating? Please turn on your heating and see if you still have such fluctuations after heating continuously for a week.

Hello, in our new building (built in 2016) we currently still do not have a heating system ... What are your experiences here?

What does that mean? Is no heating installed? There will be no experiences, as a new building without heating is neither planned nor purchased, habitable, approved after construction, and therefore cannot be occupied. A 6kw wood burner stove is not a permanent alternative. What is the temperature around 3 p.m.? Regards