Have you ever heard words like “split system” and wondered what it was? Put simply, a split system is a form of air conditioning that consists of an indoor unit, such as an air handler or fan coil, and an outdoor unit, such as a condensing unit. It’s used mainly in commercial and industrial settings to help regulate the temperature and keep occupants comfortable, but split systems can also be found in some residential homes. But what is the official business definition of a split system? Let’s take a look.