Warranty and movable goods

as mentioned, the kitchen is included

If I recall my law lecture, the kitchen is a controversial topic. As far as I know, a specially adapted fitted kitchen can indeed be part of the house, whereas a standard kitchen unit can be removed without any problem. The transition is of course fluid and a matter of interpretation. In the case of a tenant, it is always assumed that they will take their fitted kitchen with them upon moving out.
I quickly found a court ruling where the kitchen was included in the house auction.

specially customized fitted kitchen [....] 08/15 kitchen unit

Standard lawyer's response: It depends!

Basically, the kitchen is not that difficult. The cabinet elements are mostly standard (e.g., 60cm wide) and therefore fit into any room of any house. Often only the cheap particle board kitchen countertop is special, which can be replaced for little money. A kitchen belonging individually to the house is probably more of a designer piece made from 1 gus or something similar.

You forget that the kitchen should be viewed as a unit, and here, for example, a countertop extending to the window and a customized cabinet could be decisive, even if that doesn’t make up the majority of the kitchen acquisition costs. But I think hardly anyone will get a kitchen through the general contractor; the satellite system is more likely, which falls under the 2-year warranty.

I am of the opinion that when it comes to fitted kitchens, it is not necessarily the quality that matters, but rather whether they are installed "permanently." In a private home, this would mean that the kitchen was installed for the purpose of permanent use and can therefore certainly be considered a fixed part of the house. Similarly, I believe the same applies to rented apartments that include a kitchen and are rented out with it; this kitchen was also installed by the landlord for the purpose of permanent use. However, if the tenant brings a kitchen with them, which can also be custom-made and high-quality, it could potentially be considered a movable item since it is not intended for permanent use because the tenant could move out again and take the kitchen with them. I think it is a matter of interpretation and how one argues.

The OP probably isn't worried about the kitchen.
His question about the controlled residential ventilation or heating system has been explained by the construction expert.

Whether a kitchen is a movable item requires a well-thought-out and clever formulation to achieve what one wants to achieve.
In the case of an expensive kitchen where the countertop is also used as a windowsill, the conversion is comparatively inexpensive, so it can be assumed to be a movable item.