Air-and-water systems condition spaces by distributing air and water to terminal units installed in the conditioned spaces throughout a building. The air and water are cooled or heated in central mechanical equipment rooms. The following systems are distinguished:

Air-and-water systems apply primarily to exterior spaces of buildings with high sensible loads. They may, however, be applied to interior zones as well. These systems work well in office buildings, hospitals, hotels, research laboratories, and other buildings where their capabilities meet the performance criteria.