Posted on December 18, 2019December 16, 2019 by PaulContest #634 Hint These apartment buildings have a somewhat unique form of building heat.
https://www.google.ch/maps/@56.8680688,14.8188641,183m/data=!3m1!1e3
Passive houses in Växiö, Sweden
Passive houses in Växjö, Sweden
56°52’5.23″N 14°49’10.04″E