Split unit heat and AC is a type of air conditioning system that uses two separate units to cool and heat a space. The two units are typically installed in different locations, with one inside the space and the other outside. The inside unit is responsible for cooling or heating the air, while the outside unit is responsible for the exchange of heat between the inside and outside of the space. Split unit heat and AC systems are often used in homes and businesses due to their efficiency and convenience. They are also relatively easy to install and maintain, making them a popular choice for many. Split unit heat and AC systems are typically more expensive than other types of air conditioning systems, but they offer a more efficient and reliable way to cool and heat a space.