A split system heat pump is a type of HVAC system that consists of two main parts: an outdoor unit and an indoor unit. The outdoor unit contains the compressor, condenser coil, and expansion valve, while the indoor unit contains the evaporator coil and air handling unit. The system works by using a refrigerant to transfer warm or cool air from the outside air or ground into the home. This allows the system to provide both heating and cooling for the home. It is called a split system because the two main components are separated and installed in different locations.