To start with, ducted air conditioning can serve as central air conditioning. Giving heating and cooling to much larger houses with complicated layouts. Primarily multi-storey homes with tougher to succeed in areas. A break up system is probably not economically viable – and actually might be cost-prohibitive, for larger houses. https://sites.google.com/view/teknicoolairconditioningg4k/best-ducted-air-conditioning-sydney