A split unit AC/Heat is a type of air conditioning and heating system that is split into two separate units. The first unit is an outdoor unit that houses the compressor, condenser, and expansion valve. This unit is responsible for cooling and heating the air that is circulated throughout the home. The second unit is an indoor unit that contains the evaporator coil, blower, and air filter. This unit is responsible for circulating the cooled or heated air throughout the home. The two units are connected by refrigerant lines that transfer the cooled or heated air from the outdoor unit to the indoor unit. Split unit AC/Heat systems are becoming increasingly popular due to their efficiency and cost savings. They are also relatively easy to install and maintain, making them a great choice for many homeowners.