I would like to seek someone help whether the following sentences are correct or not and how to use the following words.
An air-condition system was designed for the building.
An air-conditioned system was designed for the building.
An air-conditioning system was designed for the building.
An air conditioner was designed for the building.
Only the last two are correct, though the last one sounds mechanically unlikely.
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Only the last two are correct, though the last one sounds mechanically unlikely.