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@qbteachmt wrote:

I was pointing out a Central AC isn't also a split system, even though parts are outside and parts are inside.

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The AC *IS* a split system.  That is what the outside and inside refer to.  Most residential AC systems are "split".

There are also "package" systems where everything is together (larger units are usually outside; both AC parts plus the heat) and then the air is blown into the building.  A window air conditioner, in-the-wall units (the kind at most hotels) or a big HVAC unit on the top of a commercial building are examples of that.