Refers to a machine or device that cools the air, typically an air conditioning unit. Not used for a simple fan.
In summer, I can't sleep without an air conditioner.
The air conditioner in this room is old and doesn't work well.
エアコン is the common abbreviation for air conditioner in everyday speech. 冷房機 is more formal and technical.
クーラー is a common loanword for air conditioner, often used in casual contexts. 冷房機 is a native Japanese compound.
Standard kanji spelling for an air conditioning unit.
Alternate kanji spelling; 器 is a general character for devices, but 冷房機 is more common.
Compound of 冷房 (cooling, air conditioning) and 機 (machine, device).