エアコンeakon

1. nounair conditioner; air conditioning; aircon
   この部屋へやにはエアコンがありますよ。↗

   This room has air conditioning.

• SynonymクーラーCasualColloquial: refers to cooling only, while 「エアコン」 both cools and heats; it can also mean a portable cooler box.
• Synonym空調くうちょうNeutralNeutral term for air-conditioning equipment or technology, typically the overall system in buildings and public facilities; for a single unit, 「エアコン」 is usual.
• SynonymエアコンディショナーNeutralThe full form of 「エアコン」; more formal and much less common. In everyday speech, 「エアコン」 is the normal choice.
• SynonymエアコンディショニングWrittenWritten/formal prose term for air conditioning; it can mean the technology or the equipment. Long and rarely used; people say 「エアコン」 in daily life.
• SynonymルームクーラーNeutralAn older term for a room cooling unit; today 「エアコン」 is the usual word for one.

Say 「エアコン」 in everyday speech, whether cooling or heating. Use 「クーラー」 for cooling only, and 「空調」 for building-wide air-conditioning systems. The longer loanwords and 「ルームクーラー」 are rare or dated.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. エアコンディショナー。