Operate heat pump autonomously with photovoltaic system.

I think the savings on heating consumption will not bring major successes; in my opinion, if it works, it will only be through a 40+ with corresponding savings on electricity consumption (approx. 35,000€ in funding for 2 residential units + corresponding annual savings on electricity consumption estimated at 800-1000€). That should make the whole thing worthwhile or at least break even.

Jochi is quite right.

Whereby: The subsidies also have to be financed. Capital investment.

You have to pay for it anyway if you build like that.

If you then end up with a black (or red) zero: Brilliant.

The rest is currently - as of 2016 - a question of willingness, the green thumb, enjoyment of the matter, and the ability to have access to appropriate funds.

Because honestly: zero interest rates or not, the additional costs are hardly offset in such a way that enthusiasm arises in monetary terms.
You can do nice calculations, but that is and remains just nice calculations.

Whoever builds KFW40 or 40+ derives their enthusiasm from somewhere else then.
I think that’s good - whoever can and wants to: Go for it. An (almost) self-sufficient house is a strong, brilliant thing that would also bring me joy.

The energy saving ordinance is constantly being tightened anyway. I think by 2025 the area KFW40+ or even stricter will be standard anyway....

Best regards
Thorsten

I will probably tackle the topic 40+, or rather, the planning is currently strongly leaning in that direction. When I have more precise numbers, we can gladly revisit the topic, I think it will be interesting for many in the future.

We will hopefully find out this week. It may be that the subsidies end up at around +/- zero. The lost living space due to the thicker brick would have to be compensated, that probably depends on further factors.

We will hopefully find out this week. It might be that with the subsidies it ends up around +/- zero. The lost living space due to the thicker bricks would have to be compensated, that probably still depends on that.

Great, please be so kind and report the news here then. Thank you.

I will probably address the topic 40+, or rather the planning is currently strongly heading in this direction. When I have more precise numbers, we can certainly revisit the topic, I think it will be interesting for many in the future

But yes, it will definitely be interesting 100.0%. It would be great if you also report back at the appropriate time.

Thanks.