Potential savings opportunity KfW 70 vs. 55 - Air heat pump

Hello everyone,

We are planning to start the planning of a new building (house) soon.

Therefore, I am wondering which Kfw standard is better in terms of heating costs: is it worth investing in a KFW 55 house or is it more economical to build a Kfw 70 house (additional costs for a higher standard vs. savings potential on heating costs through better insulation).

Since we are still at the beginning, we have not yet decided between solid construction and prefabricated house. My only question is how high the savings potential of a KfW 55 house is compared to a 70er (with an air heat pump, approx. 150sqm), to justify the higher costs.

It is clear that electricity will not become cheaper.

The Energy Saving Ordinance will also be changed in April 2016 so that the 100% house will correspond to today’s still valid KfW 70 standard.

Does anyone have experience with this and can give me experiences and tips for decision-making?

Is it so clear that electricity will not become cheaper? Actually, it should, as soon as we get storage under control... there is an overproduction. Well, but that’s not the topic.

Are you building with an architect? If you are building with a BU or GÜ, they will probably make the decision for you through their offer or pricing...
You can also simply calculate it bluntly: 20 kWh/m²a at 150 m² costs you 3000 kWh - with an annual performance factor of 3 (that’s already a good air-to-water heat pump) you then pay €23 for heating per month. At 40 kWh/m²a then €46 and at 60 kWh/m²a €70. Over 15 years, the difference amounts to €4200 + interest or €8400 + interest... from experience, the offers are always borderline economical, so depending on the consideration period, they either add up or not... so neither a total economic loss nor the investment of the millennium. I also think that the feeling of life doesn’t differ anymore – no cold walls, but also always equally airtight halls with forced ventilation.

Hi,

Wow, thank you for the quick and competent response!

Is it so clear that electricity will not get cheaper? Actually, it should

yes, actually...

Actually, public transport prices should also go down, as the number of users is rising extremely.
Actually, the solidarity surcharge can also be abolished...
And above all: actually, I'm not even hungry, but still go to eat...

I see absolutely no way for electricity prices to go down, especially as long as the grids remain privatized. Why should 'they' ruin their sources of income? If someone else does it, gladly :)