Air conditioning units are devices designed to cool indoor spaces by removing heat and humidity from the air. They work by circulating refrigerant through a system of coils, absorbing heat from the indoor air and releasing it outside. This process helps maintain a comfortable temperature, especially during hot weather. There are various types of air conditioning units, including window units, split systems, and central air systems. Each type has its own installation requirements and cooling capacities, making it important to choose the right one based on the size of the space and specific cooling needs.