I just had a longer conversation with our BU regarding saving possibilities. He asked me if we really want to build Kfw 70 or if Kfw 85 is sufficient. In that case, we could do without the ventilation system and the solar system, thus saving 12,400 EUR.
What is your opinion on this? Is it worth it? Through the KfW loan, we would save about 9,000 € in interest over 30 years.