Plan a gallery in the living room energetically and sensibly

Others have set their ceiling height throughout the entire ground floor to 2.70 - now calculations may be made

Regards

Thank you very much for your answers!

Surely it is clear, every feature has its price.
Unfortunately, the proportionality is not clear to us.
How much higher could the monthly heating costs be caused by such a gallery,
or how much higher is the energy demand 10 / 20 / 50 %?

However, it is also important for us to build energetically sensibly.
Unfortunately, one cannot really reconcile one with the other.

From a heating technology perspective, we are currently planning an air heat pump,
powered by the energy of a [Photovoltaik Anlage] with [Energiespeicher].
In winter, as support, a fireplace stove with water storage.

You mean it is more expensive to keep a current Energy Saving Ordinance house with a gallery at 21 °C than one without a gallery (when it's cold outside)?

Yes, at the latest when you relate the heating costs to the living area.

If you have a 200 sqm house with a 20 sqm gallery, that means only 180 sqm left... Then the heating costs are initially the same, with less living area. So about 10% more.

In addition, there is what Episode writes, the heat rises to the ridge...

I have no experience, but I estimate the energy costs will be about 10-15% higher than in a smaller house with the same usable living space.

If you want it precisely, you have to consider the area of the building envelope and compare the heating load.

Oh, regarding the living space. Right.

In addition to what Episode writes, the heat rises to the ridge...

Can someone back this up with numbers? What is the temperature gradient in a current Energy Saving Ordinance house with a ceiling height of 2.70 m? How high is it in an old building from 1910 with a ceiling height of 4 m? Does the additionally heated air volume (and also the additional existing wall) in the Energy Saving Ordinance house with high ceilings or with a gallery play a major role in heating costs, which are essentially determined by heat losses to the outside (mainly through ventilation)?

How much higher could the monthly heating costs be that such a gallery causes, or how much higher is the energy demand 10 / 20 / 50 %?

I'm interested in that too. From gut feeling, I would say well below 10 %. Maybe the person who does the Energy Saving Ordinance calculation for you has previously calculated houses of comparable size with/without gallery. The respective energy certificates would have to be evaluated.

It's more about the envelope surface than about the volume.... it does need to be heated once but then it doesn't lose energy by itself.

I think the calculation of the living area (including the area of the gallery) is already quite good.
That's also about 10%. In this respect, one could indeed assume about 10% higher heating costs.
The question is, how does the ceiling height affect this?

I think in this context it is important to understand how the air flows, or rather why.
What promotes the warm air to flow upwards? It's not just the insulation.

Here are some additional questions:

1. Placement of the wood stove (in the open gallery area, or rather in the dining area where there is a normal ceiling height – but adjacent to the gallery)?

2. Closing the cellar stairs with a door on the ground floor (currently open to the cellar hallway)
Possibly the colder air from the cellar hallway promotes the rise of warm air in the gallery area)
Chimney effect

3. How important is triple glazing in this context? Due to the colder surface of double glazing, an unfavorable air flow could also occur!?

4. How does it behave with the garage in the cellar? Is it rather uncritical with appropriate insulation on the garage ceiling?