A split heat pump is a consists of two main components: an indoor unit and an outdoor unit. The indoor unit is typically installed inside the pool plant room, while the outdoor unit is placed outside as far as 30 meters away. These two units are connected by refrigerant lines, allowing them to work together to heat or cool your pool. In heating mode, the outdoor unit extracts heat from the outdoor air and transfers it into your pool. In cooling mode, the process is reversed.