An air conditioning unit works by moving air through a cooling element containing a refrigerant, which removes heat, transporting it to the condenser to be dispersed. A ceiling cassette air conditioning unit is no different and works on exactly the same principlecassette air conditioner (plural cassette air conditioners) A ceiling- or wall-mounted or suspended air conditioner, for when space is limited, because there is no available walls to mount a split system or where there is limited ceiling space for a ducted system.
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