human
What are the different types of ac units and what are the differences between them?
assistant
1.  Air conditioning systems can be split, window, or central.
2.  Split air conditioners typically have two separate components: an indoor unit and an outdoor unit.
3.  Window air conditioners usually have a single component that is placed in an open window.
4.  Central air conditioning systems use ductwork to distribute cooled air throughout a building.