What is the definition of a Mini Split System HVAC? A mini split system HVAC is a type of air conditioning system that utilizes two distinct units, one indoor and one outdoor. The outdoor unit contains a compressor, condenser, and an expansion device, while the indoor unit contains an evaporator and a fan. The two units are connected through a series of tubes and wires, which provide the power and condensation exchange between the units. The mini split system is designed to provide efficient and effective cooling to multiple areas of the home. This type of air conditioning system is often used in homes or businesses with limited space and is a great alternative to a traditional central HVAC system. It is a great solution for those looking for an efficient and cost-effective way to cool their home or business. The mini split system HVAC is a great way to reduce energy use and keep your home cool and comfortable.