noun
indoor unit (of an air conditioner, etc.)
Refers specifically to the indoor component of a split-system air conditioner or similar equipment. Often contrasted with 室外機 (outdoor unit).
エアコンの室内機から水が漏れている。
Water is leaking from the indoor unit of the air conditioner.
室内機と室外機を接続する工事が必要です。
Installation work is needed to connect the indoor and outdoor units.