A split unit air conditioner is a type of air conditioning system that is composed of two separate components: an outdoor unit and an indoor unit. The outdoor unit is typically located outside the building and contains the condenser, compressor, and fan. The indoor unit is located inside the building and contains the evaporator and air handler. Split unit air conditioners are a popular choice for homes and businesses because they are energy efficient, quiet, and reliable. The outdoor unit is connected to the indoor unit via refrigerant lines, which transfer the cooled air from the outdoor unit to the indoor unit. The indoor unit then circulates the cooled air throughout the building. Split unit air conditioners are typically more expensive than window units, but they are more efficient and can cool larger areas.