[cmutel]

The Nordic countries are famous for pioneering low temperature district heating. This can be as low as 50 C. Sorry, no citation, this is what I heard at a project meeting on district heating networks in Switzerland.

District heating with such (relatively) low temperatures is no problem, the energy to pump is much less than the energy to heat. My house is heated from nuclear waste heat pumped more around 10 kilometers.

[Hamuko]

My apartment will be heated by Microsoft Teams calls.

https://yle.fi/news/3-12363215

[Symbiote]

This is the English part of the website for the Danish District Heat Association.

My apartment and office (like much of Copenhagen) are heated through incinerated waste.

https://www.danskfjernvarme.dk/sitetools/english