The objective of the diploma thesis was to perform the conversion of the air conditioning system and connect it into the telemetry system. The second chapter describes the development of air conditioning systems through history and the operating principle of modern air conditioning systems. This is followed by the description of the requirements for the final product. These are divided into three parts; in terms of fault detection, performance, and telemetry data. This is followed by the conversion design, which is described in the fourth chapter. We inspected the state of the device before the conversion and outlined the bases for the upgrade. We selected the missing components and outlined the diagram of our final product. The fifth chapter deals with work preparation. This includes the description of the communication between the controller, GSM module, and the server. We designed the electrical diagram, which enabled us to carry out the actual conversion. In addition, we have described the implementation process, which includes programming of the controller and the GSM module, and product testing. The last part of the thesis presents the telemetry results. This chapter also describes the upgrade possibilities.