the air-conditioning needs of a large building can be met by a single central system or by several individual window units. considering that both approaches are commonly used in practice, the right choice depends on the situation on hand. identify the important factors that need to be considered in decision making, and discuss the conditions under which an air-conditioning system that consists of several window units is preferable over a large single central system, and vice versa.the air-conditioning needs of a large building can be met by a single central system or by several individual window units. considering that both approaches are commonly used in practice, the right choice depends on the situation on hand. identify the important factors that need to be considered in decision making, and discuss the conditions under which an air-conditioning system that consists of several window units is preferable over a large single central system, and vice versa.