A HVAC split system heat pump is a type of heating and cooling system that is composed of two separate components. The first component is an outdoor unit that houses the compressor, condenser, and expansion valve. The second component is an indoor unit that houses the evaporator and fan. This type of system is designed to transfer heat from one area to another. It works by taking heat from the outside air and transferring it to the inside air. The system can also reverse the process and transfer heat from the inside air to the outside air. This type of system is often used in homes and businesses as it is energy efficient and can provide both heating and cooling. It is also cost effective as it requires less maintenance than other types of heating and cooling systems.