KFW 55 according to the new Energy Saving Ordinance

Hello everyone,

since we will probably be able to purchase a plot of land next year, we want to have more talks with construction companies in the coming weeks.

After reading about various topics here, the question for us is what the best way is to achieve the KFW 55 standard.

The background is that through the KFW standard we receive very well subsidized loans from the Saxon Development Bank (SAB).

For us, the only conditions are the controlled residential ventilation which we know from acquaintances and since we cannot/will not ventilate daily, the extra investment is worth it to us.

Whether we choose a gas condensing boiler or a ground-source heat pump is honestly indifferent to us; it should be the cheapest option in the overall package from a pure investment perspective.

We are a family of four (30, 30, 3, 4 weeks) and want about 140/150m2 including a home office for my wife. The plot is about 900m2 and fully south-facing.

If any conditions are missing, please let me know.

Thank you
Goldi

What is the question?

With which means can one most easily/cheaply achieve the Kfw55 standard today?

Or how can one plan their house so that it meets the above-mentioned requirements most cost-effectively?

There is no single solution, but I think that a controlled residential ventilation + brine-water heat pump with a ground collector, a photovoltaic system, and proper insulation KS+WDVS can be a fundamentally good and affordable solution (not just on paper).

Hello everyone, is it possible to achieve the KfW55 standard with a controlled residential ventilation system, a solar system with buffer storage, and a gas condensing boiler? Or rather, what is still missing here to achieve this standard? Regards

Hi everyone, is it possible to achieve the KfW55 standard with a controlled residential ventilation system, a solar system with a buffer storage, and a gas condensing boiler? Or rather, what else is needed here to achieve this standard?

Regards

I do think this is possible; the question is how high the additional investment in insulation, etc., needs to be to be able to meet the standard. That’s what my first post is about (see above)!