断熱

だんねつ

insulation

noun suru-verb vi adj-no

freq #18

Example sentences

断熱（だんねつ）が悪（わる）いと、いくら暖房（だんぼう）してもちっとも暖（あたた）かくならない。

If it's badly insulated, it won't warm up regardless of how much heating you use.