I see some early trends in Poland (a lot of soviet-style concrete blocks of flats) where the modernisation is done better. Article in Polish, but worth transla

I see some early trends in Poland (a lot of soviet-style concrete blocks of flats) where the modernisation is done better. Article in Polish, but worth translating or just looking at the photos: https://www.money.pl/gospodarka/w-tym-miescie-nie-martwia-sie-cenami-wegla-i-gazu-bo-nie-musza-6820463567457088a.html https://www.money.pl/gospodarka/w-tym-miescie-nie-martwia-si... Shortly: insulation, new windows, solar panels, heat pumps (heating + warm water). They do not show "before" photos, but I found some similar building before renovation on the same street: https://www.google.com/maps/@51.3586963,21.5793371,3a,75y,161.66h,106.81t/data=!3m6!1e1!3m4!1sB3p7Py82-iwYfTAYyXkZ-g!2e0!7i16384!8i8192 https://www.google.com/maps/@51.3586963,21.5793371,3a,75y,16... They mention 90% savings in heating costs, which apparently pays off the debt they had to take to make the upgrades.