Construction costs are currently skyrocketing

What makes sense? Now realistically considered... So please don't come with heat pumps as the sole energy source ;)

Sure! Where is the problem with heating all residential houses with heat pumps? Especially in new buildings absolutely no problem. Of course, it can gladly be supplemented with district heating that is produced anyway in industry or power generation plants.

The ratio of existing buildings to new construction is about 10:1 (!!!) You simply cannot electrify everything. That is absolutely unrealistic! Also think about the electricity supply. The grids are already more than overloaded... Especially if at some point we are all supposed to switch to electric cars. Even if you think about hydrogen (it's also a gas!), it can only work if all existing gas pipelines are replaced (who is supposed to pay for that?). Unfortunately, the existing gas pipelines are not suitable for H2. Furthermore, H2 is about 3 times more expensive than natural gas. When you think about climate targets, you must not only think about single-family homes. They are negligible in the overall consideration...

You have to think of everything and do something everywhere, instead of always pointing fingers at others. Otherwise, no one does anything.

That is not correct. It is not a problem at all to electrify everything. Please do some reading first and do not spread hearsay.

Uh that is my solid wood house but ecological. ;)

That will also have a slab foundation, right? As already calculated, around 30 tons of CO2 for a single-family house are realistic. Is there possibly a double garage added? For the slab foundation another 10 tons, that makes already 40 tons. For our KFW-55 house with 135 m2 we needed 550 m3 of natural gas last season, so just over 1 ton of CO2. Just for comparison...

the ratio of existing buildings to new buildings is about 10:1 (!!!)

That supports my thesis that it's not a problem to stop relying on gas in new buildings!
And nevertheless, it doesn't exclude gradually converting existing buildings as well!

You simply can't electrify everything. That's absolutely unrealistic!
Also think about the power supply. The grids are already more than overloaded...

Wrong. Where are grids already overloaded (in Germany)?

Even if you think of hydrogen (which is also a gas!), that can only work if all existing gas pipelines are replaced. The existing gas pipelines are unfortunately not suitable for H2. Besides, H2 is about 3 times more expensive than natural gas.

Why should I think about that?
Since when do heat pumps need hydrogen?