How can one circumvent the Energy Saving Ordinance and avoid bureaucratic madness?

Aren't you... whether underfloor heating or radiators, the air is warmed equally... just at different speeds...

It will be dry in any case...

Underfloor heating is simply slower, but I don’t feel comfortable with 23 degrees on Monday, 18 on Tuesday, and 25 on Wednesday. Therefore, I see no problems here, only pleasantly warm feet in winter.

Whether a room with underfloor heating is warmer than one with radiators doesn't matter. What is, is often not perceived. Felt temperature and thermometer reading are also two different things in meteorology. Underfloor heating makes warm feet, so it feels warm whenever you are in such a room in winter with shoes on, the feeling is that it is cozy here. And it is slow to regulate as well. No offense to underfloor heating, don’t get me wrong, but it has these peculiarities. Karsten

Felt temperature and thermometer reading are also two different things in meteorology.

This is solely due to wind and humidity and not due to any kind of esotericism. I have never been able to detect a difference between felt and measured temperature indoors. I always found it stuffy and warm at my grandparents' old building. There was never any ventilation and it was completely overheated. Completely without insulation and underfloor heating.

It already exists and is also taken into account in building physics. Keyword wall temperature. In an insulated house, the wall temperatures are higher than in an uninsulated house. Therefore, 20° in a new building feel warmer than in an old building. Consequently, a new building does not have to be brought to the same temperatures as an old building, which additionally saves energy.

Has no one noticed yet: 100k for a large plot of land in or near Hamburg and right by the lake + money is no object + he has loads of time..

And you take this guy seriously?

Come on..