The antonyms of the word "heat air cond J" vary depending on the context in which it is used. If the word refers to temperature regulation for indoor spaces, some potential antonyms are cold air conditioning, cooling, or refrigeration. However, if the word refers to heating equipment, some possible antonyms include air conditioning (in the context of warming), cooling, or ventilation. Additionally, if the word is used in a figurative sense, antonyms might include emotional detachment, calmness, or cool-headedness. In any context, antonyms of "heat air cond J" are words that are opposite in meaning, conveying a sense of cooling or chilling instead of warming.