A local air conditioning system is a complete package that can contain cooling and heating source, a circulation fan, a filter, and control devices. There are three main types. Window air-conditioner. This system is a packaged device consisting of a vapour compression refrigeration cycle that contains a compressor, a condenser, an expansion valve, and an evaporator, in addition to a fan, a filter, control system and housing. Window air conditioners are mostly installed in a framed or unframed opening in building walls and in window openings without any ductwork and distribution the cooling or heating air effectively inside the conditioned space. The air conditioning consists of an evaporator and condenser where the condenser is located outside the space while the evaporate is inside the space, however, it serves the entire single zone with the thermal requirements. The heating process can be achieved by adding an electric resistance coil in the air conditioning or reversing the refrigeration cycle to act as a heat pump. Many feature designs are produced to provide aesthetical values and improve the quality and response. Unitary air-conditioner. It is similar to window air conditioners as far as the equipment is concerned but it is designed for commercial buildings. It is installed on the exterior wall of the building. There is a Horizontal hierarchy representation of the main types of local HVAC systems. A single zone will be having one unitary air-conditioner as in each guest room in many hotels. A packaged rooftop air- conditioner. It consists of vapour compression refrigeration cycle, a heat source such as heat pump and electric resistance; an air handler such as dampers, filter, and fan; and control devices. This system may be connected to ductwork and serve a large-size single zone that cannot be served by unitary or window air conditioners. Split systems. The split systems contain two central devices, the condenser, located outdoor, and the evaporator, located indoors. The two devices are connected by a conduit for refrigerant lines and wiring. This system takes care of small-scale single-zone systems since the location and installation of window, unitary or rooftop air conditioners may affect the esthetic value and architectural design of the building. The split systems consist of one condenser unit that is connected to multiple evaporator units to serve multiple zones as possible under the same conditions or different environmental conditions.