New construction in Germany is insanely well insulated -- by law. But we have a huge existing base of old construction that takes ten times as much energy to he

New construction in Germany is insanely well insulated -- by law. But we have a huge existing base of old construction that takes ten times as much energy to heat up or more. You can't just hear all that down, and improving the insulation is expensive, more expensive than just installing a new heating system. Think at least 50k EUR for a small house, five to ten times as much for a typical inner city large, multi tenant building.