noun, noun which may take the genitive case particle 'no'
high airtightness; good airtightness
Technical term used in construction, architecture, and building performance to describe a structure with very low air leakage. Often appears in compound phrases like 高気密住宅.
See also: 気密
この家は高気密なので、冬でも暖かい。
This house has high airtightness, so it stays warm even in winter.
高気密住宅は省エネに効果的
Highly airtight houses are effective for energy saving.
高断熱 means 'high thermal insulation' and is often paired with 高気密 in building performance contexts.
Compound of 高 (こう, 'high') and 気密 (きみつ, 'airtightness').