Many large commercial buildings use rooftop systems, also called packaged HVAC systems. While common, not all smaller commercial buildings use them. Some still use split systems, which tend to be more common with residential buildings. Essentially the difference between split systems and a rooftop system is in the name. Half the unit is inside, half of it is outside. Packaged systems are all in one unit. In commercial buildings, they are referred to as rooftop systems because that is typically where you find them.
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