What is a Mini Split Technology? For many years ductless air-conditioning systems have been the quiet solution for cooling and heating problems around the world. A Mini Split a/c system has three main components: an indoor air handling unit, an outdoor condensing unit and a remote controller. These units are easily connected by refrigerant lines running through a small three-inch opening inthe wall or ceiling. The outdoor unit cycles the refrigerant through the lines to and from the indoor unit, where the air is conditioned and distributed into the space. Installation is as simple as mounting the indoor and outdoor units, connecting the refrigerant lines, and making a few electrical connections. An easy installation for your contractor means you’ll be enjoying the comfort of your Mini Split faster. For the Home: You don't need ductwork or a window space. The sleek wall-mounted indoor unit mounts discreetly high on the wall. The outdoor unit is slim and requires minimal ground space or service clearance.. For the Office: Mini Splits are the perfect solution for those offices and zones within your commercial establishment that are never the right temperature.