We are planning to build in 2022; the planning begins

In my opinion, CO2 was not turned off.

CO2 was, in my opinion, not shut off.

CO2 plays no role at all when burning wood. Whether you burn the wood or the tree in the forest simply dies is completely irrelevant because only the amount of CO2 that the tree absorbed during its growth can ever be released. That’s how I learned it, but I’m happy to be corrected if there are new findings by now.

That is true, but strictly speaking, one should then ensure that only wood from a sustainable source (i.e., one tree is cut down, at least one is replanted) is burned.

You can certainly imagine the resulting temperature in a room, and no, the underfloor heating cannot be turned down quickly.

Above all: at most it could only be turned down - not add cooling or remove heat (which the controlled residential ventilation also cannot do quasi-simultaneously) - so windows are additionally opened.

CO2 plays no role at all when burning wood. Whether you burn the wood or the tree in the forest simply dies is completely irrelevant because only the amount of CO2 can be released,

OT: No. You have turned a tree into CO2 in the stove within a few days. Leave a tree lying in the forest and check back after 15 years. It is still there. It now provides habitat for fungi and various small animals. It also provides sun/windshade near the ground against erosion.

The renewable raw material is, in my opinion, a very big fig leaf.

BTT: Here in the forum you will find a similarly polarized view on fireplaces as with vinyl vs. parquet. We let it go because, first, the money for this "gimmick" could no longer be prioritized. Secondly, we got scared that the place might simply become overheated.

Let a tree lie in the forest and check back after 15 years. It is still there.

Yes, but that has nothing to do with CO2. As wrote, just make sure reforestation is done (or simply plant a little tree in your own garden) and then everything is balanced again If you go that far, you would also have to calculate how many trees are infested by bark beetles and therefore have to be cut down in order not to harm the surrounding plants, etc.