How is four stories of small airconditioning units more efficient than a large chiller?pic.twitter.com/bWkUGRn1NB
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Typically, instead of sending (expensive, precious) refrigerant to each apartment, they send chilled/heated water (with antifreeze) to PTACs in each apartment.
The *best* systems use the rejected heat from air-conditioning to heat water. It's fantastic.
In theory, like with multi split systems with refrigerant, you can move heat between apartments if one person is too warm and the other too cold, which is vastly less energy intensive than cooling and heating separately.
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