Yeah, maybe I used the wrong word, as I'm not a native English speaker, I meant it as good at keeping the heat in during winter and the cold air also in during

Yeah, maybe I used the wrong word, as I'm not a native English speaker, I meant it as good at keeping the heat in during winter and the cold air also in during summer. And for that the houses made (partially) out of earth itself are pretty good. You have to be careful not to allow water infiltrations, but other than that those houses are pretty durable, even against earthquakes (my grandpa from my mother's side used to live in one).