Heating, ventilating, and air conditioning (HVAC) of buildings is accomplished in many ways, depending on the size, configuration, and location of the buildings and the degree of environmental control needed. Small simple facilities can be cooled with a localized cooling unit whereas larger facilities employ several large units or centralized systems. Air conditioning system types are broken down into two types: direct expansion (DX) systems, in which there is direct heat exchange between the building air and the refrigerant, and chilled water systems that utilize chilled water as an intermediate heat exchange medium to transfer heat from the building air to the refrigerant. It is useful to know what an ideal HVAC system would look like. Although compromises sometimes have to be made, they should be made with the knowledge of how and why they are imperfect. This 4 hours quick book provides comprehensive information on the air-conditioning cooling systems. It details the type and characteristics of commonly used cooling systems with illustrations, advantages and disadvantages. This course is applicable to HVAC engineers, facility engineers, architects, environmentalists, operations and maintenance personnel, as well as consultants and contractors who construct, build and manage facilities. The course includes a multiple-choice quiz consisting of twenty (20) questions at the end. Learning Objective At the conclusion of this course, the student will: Learn the different types of cooling systems - DX and Chilled water systems; Understand the efficiency terms and the rating of cooling systems; Understand the key factors in selection of DX systems, their advantages and limitations; Understand the key factors in selection of chilled water systems, their advantages and limitations; Understand the key factors determining the heat rejection systems; Describe five common methods of heat rejection with advantages and limitations."