We offer basic information about HVAC air conditioning systems: Types of air conditioning systems: Central Air Conditioning – These systems use ducts to distribute cold air throughout the building from a central unit. Ductless Mini-Split Systems: These systems do not require ductwork and are suitable for existing ductless homes or buildings. They consist of an outdoor compressor/condenser unit and one or more indoor air handling units. Window Air Conditioners: These are self-contained units installed in windows or through-wall openings, suitable for cooling individual rooms or small spaces. Portable Air Conditioners: These are mobile units that can be moved from room to room and usually require a window or vent to exhaust hot air outside. How Air Conditioning Works: Air conditioning systems work by removing heat from indoor air and transferring it outside. They use refrigerants to facilitate this process, which involves cycles of compression, condensation, expansion and evaporation.