> I often wonder whether this constitutes stealing. No, definitely not. You're not responsible for the insulation context of the apartment you're renting (as i

> I often wonder whether this constitutes stealing. No, definitely not. You're not responsible for the insulation context of the apartment you're renting (as it pertains to eg such things as shared or external walls). You're not responsible for the apartment design. You're not responsible for the materials it is constructed of, nor how thick its walls are. You would have to do something dramatic to the construction of the apartment to alter the context you're describing, and that's likely not in your legal purview to do, as such it's not your responsibility morally or legally.