Air-water heat pump or gas + controlled residential ventilation in a 135 sqm single-family house?

Received the answer today immediately:

"The detailed Energy Saving Ordinance calculation is not yet available to us. We have only received the statement from the energy consultant that you can do without the solar system when choosing controlled residential ventilation. When the exact devices and the factory planning are available, he can create his calculation in detail. I would be happy to share the key figures with you then. However, this is not yet possible at the moment. I ask for your understanding."

Received the answer immediately today:

"The detailed Energy Saving Ordinance calculation is not yet available to us. We only received the statement from the energy consultant that you can do without the solar system if you choose the controlled residential ventilation. Once the exact devices and the structural planning are available, he can prepare his calculation in detail. I would be happy to share the key figures with you then. Currently, this is not yet possible. I ask for your understanding."

It's a pity, but thank you very much for the feedback.

I once entered our house into an Energy Saving Ordinance calculator with all the U-values etc. and came to the result that although the Ht value is 15% below the current Energy Saving Ordinance requirement, the annual primary energy demand for the combination of gas + controlled residential ventilation without solar is not 15% below the current Energy Saving Ordinance requirement (due to the compensation measure for the Renewable Energies Heat Act).

On the contrary, only the combination of gas + controlled residential ventilation + solar achieved a perfect result just below the currently permissible maximum annual primary energy demand. Therefore, in my opinion, the combination of better insulation and controlled residential ventilation would not count as a compensation measure within the meaning of the Renewable Energies Heat Act without solar in our case. The result would be even better with a blower door test, but still not 15% below the Energy Saving Ordinance 2016 building.

Let's see what our energy consultant says about it.

I now suspect that the reference value for comparison in the numbers posted by Alex85 (Qp 55% and Ht 70%) is the Energy Saving Ordinance reference building and not the Energy Saving Ordinance requirements of the current 2016 version (Qp of the reference building x 0.75, Ht of the reference building x 1.0 = so no tightening here).

Even so, the 55% of the reference building would still be an excellent value.