Build according to KFW 70 or the Energy Saving Ordinance 2014

and also no other heating.

Well, you are reading something into it that I do not see...

I don't care at all what you read into it!

Your quote doesn't make it better - he doesn't want any heating other than gas

And you don't have to take out your bad mood on others...

I am not in a bad mood - I just don't always feel like responding to your... let's say, assertive manner.

Huh? I expressed an opinion and was then confronted by you twice - and quite bluntly too - but well, I do know your resentments against me

So I must have definitely...

Stay calm.

Exactly. I want gas and no solar because of the appearance, etc. Besides, the roof is not ideally positioned towards the sun. Therefore, I don’t know if solar is even worthwhile.

So again. How do I supply the building with gas but without solar photovoltaic ventilation...

Stay calm.

Exactly. I want gas and no solar because of aesthetics etc. Furthermore, the roof is not optimally oriented towards the sun. Therefore, I don’t know if solar is even worth it.

So once again. How do I heat the building with gas but without solar photovoltaic ventilation...

Ask architects how much additional insulation is necessary. No one can give you a more detailed answer here.