Split systems offer the most compact way to provide both heating and refrigerated air-conditioning in one. They are ideal for those wanting to heat and cool a smaller area, rather than an entire home or business. The unit is split into two, with an indoor unit and an outdoor unit – one playing the role of an evaporator and the other playing the role of the condenser.
How it operates: The indoor unit will draw in the room air through the fan coil and once it absorbs the heat, will recycle the cool air back into the room. The absorbed heat is then disbursed through the condensing unit. Heating works in a similar way, except the units play a reverse role.
You can also have multiple indoor units running from the one outdoor unit in a multi-head split system. See below.