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The point on the psychrometric chart shows 7 properties of certain air conditions. If two properties are known then 5 other properties can be calculated. Air treatment will change properties of air conditions. Changes in air condition can be determined by measuring each air condition and plotted on a psychrometric chart. One of the uses of psychrometric analysis is to determine the amount of cooling capacity used in air conditioning systems. To show the condition of the air at any time needed a system that is integrated between the data acquisition device and data display. This research designs and develops applications that are ready to display data and air psychrometric charts that can later be integrated with hardware equipped with sensors through an interface. Psychrometric applications are designed using the JavaScript programming language, so they can be opened using any web browser. Psychrometric charts are drawn using iteration calculation methods. The appearance of the air psychrometric chart is in the form of air processing points, namely outside air (OA), air mixing (EA) and indoor air condition (RA) and other air processing lines.