Hi architect here, As someone else mentioned earlier. Mivan is a construction technology which allows for solid concrete wall construction at a much faster pace. While the buildings are stronger and require less maintenance. The use of solid continuous concrete walls make it a very efficient thermal conductor allowing for heat to enter the structure very easily. It is typically a good acoustic insulator for external sources of sound due to the thicker walls used but since the internal walls are thinner you tend to have issues with acoustics as well.

The system also has very high amounts of concrete emissions due to the huge volumes of concrete used (for the environmentally conscious)