KFW40 House Project 2020 *Planning Ideas*

Improving the insulation of the roof is quite affordable. Mineral wool insulates better than aerated concrete. That is not worth it. A concrete ceiling naturally costs extra. Therefore, simply have the house planned to a standard, the providers know how to do it most cheaply and may have different approaches which you can then look at and compare. If KfW is achieved, then you get the subsidy. The house itself does not noticeably change or improve as a result.

Do not focus too much on the insulation. Planning everything else is more important: floor plan, electrical, ventilation, heating, shading, the photovoltaic system, etc. It is worth getting into all of these areas, sometimes in detail.

If you want to do something good for the environment and your wallet, omit projections, bay windows, flat roofs, special shapes, etc. as far as sensible and build square, practical, boring from the basic body. Better a few more windows then. It may look boring, but it has fewer thermal bridges, fewer construction defects, and in the long run fewer points of attack for trouble of any kind...

- Do not build a standard for the promotion.
- Build with the materials that the preferred general contractor uses as standard.
- Choose a general contractor who has the desired energy standard as a standard house. Everything else becomes unnecessarily expensive.
- Insulation
Nabu has a list of alternative insulation materials and if you Google Polystyrol Entsorgung Fraunhofer you will see that there is a lot going on there.
- Decentralized ventilation has no advantages for me. Either central or window frame ventilation.

Deep heat 2x 80m and Nibe S1255

Are you an eco-activist? If not, then an air-to-water heat pump or a horizontal collector are significantly cheaper, and in terms of heating efficiency, there isn't that much difference. Bafa funding is also possible with some maneuvering for both.

Or do you live in a freezing corner, e.g. >600m above sea level?

Edit: You write Brandenburg, I believe there isn't a single location in the entire state where an expensive drilling would be financially reasonable. What does the climate map of the German Heat Pump Association say regarding standard outdoor temperature?

- Do not establish a standard for funding

Basically correct, but with Kfw55 a certain additional investment could now even be financially worthwhile. The new funding rates have actually become very attractive.

Basically correct, but with Kfw55 a certain additional investment might now even be financially worthwhile. The new subsidy rates have actually become very attractive

Could be. Depends on the general contractor as well. Just taking a standard because of the subsidy at all costs doesn’t work.