A multi-split heat pump has two or more indoor heads in different rooms around the home. Each head has its own remote for temperature control.
Heating mode:
- Outside air is drawn over a refrigerant coil in the outdoor unit
- Heat from the air warms the refrigerant in the coil
- The refrigerant is compressed into a hot, high-pressure vapour
- Multiple lines bring the vapourized refrigerant into your house to each of the indoor units (also known as air handlers)
- In each indoor unit, the vapourized refrigerant passes through another coil where the heat is pulled out and mixed with the indoor air
- A fan sends the warm air into the room
Cooling mode is a reverse of heating mode:
- Fans in the indoor units send the cooled air into your rooms
- The indoor units pull heat from the indoor air and carry it outside through the refrigerant lines