May I share my dear colleagues
I think the correct answer is air conditioning
the reason why we should use air condtioning relates mainly to grammar as air conditioner is a countable noun so it must be proceeded by indifinite article
so we can say an air conditioner or air conditioning
لاحظ: صيغة Gerund تستجدم بدو ن اداة نكرة او معرفة
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