mietminderung

Rent reduction when the apartment is too cold

5 rulings on this topic – with reduction rate, case number and link to the decision.

Updated: October 2026 · 119 court rulings

During the heating season, usually 1 October to 30 April, courts generally expect at least 20 °C in living rooms during the day. If the apartment only ever reaches 18 or 19 °C, that is a defect – even if the heating has not failed completely.

The rulings in the table show: the colder it stays and the more rooms are affected, the higher the reduction. Measure several times a day in the middle of the room and keep a record – it is your most important evidence.

Calculate reduction →

5 rulings found

Enforce your right to rent reduction

Create a free defect notice with a rent reduction demand — backed by these court rulings.

Reduce rent
DefectReductionDescription
30 %Apartment can only be heated to 16–18 °C
20 %Room temperature only 16–18 °C
10 %Undersized radiator, only 18 °C in the kitchen
10 %Room temperature repeatedly below 20 °C
5 %Temperature regularly only 19 °C