[tharkun__]

Despite what the sibling says which is also true, especially in winter, Germany has a lot of solar in comparison to ten years ago and depending on what you do otherwise for heating building a house requires solar (it seems a lot of people use it for hot water instead of electricity) installations. Being Germany there's lots of rules which I don't know in detail since I don't live there. But here's a quick Google result for some of it: https://www.nibe.eu/de-de/support/artikel/solaranlage#pflich...

Also a lot of landlords (corporate ones) have already announced that they will only supply heating up to 20C this winter. There's a lot of discussion about that going around i.e. people complaining about that.