Terraced end house from 1915, photovoltaic system?

The air well is used in ventilation systems and air-to-air heat pumps for preconditioning the outside air. This air is guided through a gravel bed in the ground beforehand.
Colder in summer, cooler in winter -> slight air conditioning without an air conditioner in summer and warmer air for the heat pump in winter, resulting in lower electricity consumption.
In fact, the additional effort for the air well is significantly higher with modern heat pumps than the effect it provides, unless the construction pit is already present (new build). Especially with small living spaces, this is overkill when it comes to the effect on energy savings during heating.
Nice for cooling in summer if you want to avoid an air conditioner and rely only on tempering.

Thanks first of all for your contribution, MEGA informative.

Yes, we neither have a construction pit nor do we need to excavate anything.
Check that off and forget about it, I will inform the EEB.

That contradicts the air well. Either a ventilation system with air well for tempering or split air-conditioning units. It depends on your preferences, the region, and the heat loads (south-facing windows, shading, etc.) in summer.
If you have split air conditioners in every room, you can just skip the other heat pump for heating and heat everything with the air conditioning units. Also saves the expensive ceiling heating.

The splits are my wish, our condo was fully air-conditioned and I don’t want anything else. The condo is equipped with underfloor heating and split air conditioning, which was almost perfect for us.

Exactly one iFSP will be created by July.

Windows from 1988 with double glazing are a completely different world than double or triple glazed windows in 2024. In historic preservation, depending on the shape and requirements, they are of course significantly more expensive, but a glass replacement might be worthwhile instead of replacing the entire window. The EEB should be able to tell you that.

The fear is always that the windows are too "tight" with, for example, triple glazing.
Right, we have strict specifications for windows, doors, garden doors, etc.
But we will definitely have the EEB and a window manufacturer take another look, if they have to be replaced, then so be it.

In the upper floor and attic, it’s just insanely much work to remove the old ones only to install underfloor heating there. That’s why the idea was to go for low-temperature radiators here, which can also be operated with 35°C supply temperature. Besides, we also have a split air conditioner installed in the attic.

End-terrace house (monument protection only on the outside)

Has it been clarified with the monument office whether photovoltaic panels are allowed on the roof at all?

.. I think that is settled.

The exterior of the building must be preserved, the exception is the photovoltaic system on the roof because environmental protection > monument protection.

Has it been clarified with the monument office whether photovoltaic panels are allowed on the roof at all?

Hey, yes, since March of this year, as much as fits on the roof is allowed.

Then show us the plans of the house. The area for the photovoltaic system is usually not that large for a terraced house.

Then show us the plans of the house. The area for the photovoltaic system is usually not that large for a terraced house.

It should be about 25-30 sqm on the south side. Here is an excerpt from Google Earth as well as exterior views.