[worklaptopacct]

I'm renting an apartment in Germany in a building from around 1900 and I do have a clause requiring me to open my windows at least once a day for at least 5 minutes. Not sure that if it's legally enforceable, but if clauses about keeping some minimum temperature indoors are binding (judging from the fact that the government made them explicitly invalid at some point in 2022 when the country got left on thin ice after Russian gas got shut off), then I wouldn't be surprised if that one were binding as well.

[taejo]

Afair the rules about minimum temperatures that got loosened are all about requiring the landlord to provide sufficient heating that the home is livable (it must be possible to heat the home to 20°C during the day and 18°C at night with the provided heating). The tenant is only required to not damage the apartment by letting mold grow or pipes freeze.