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The hotbox machine at Climatherm laboratory was used for thermal test on the wall. This hotbox machine allows the measurement of different environmental variables. In this research, thermal performance tests were conducted on the wall imposing boundary condition vary the cavity distance between two wall elements and then these tests were performed in steady-state conditions. The wall prepared from aluminium composite and was maintaining controlling the temperature difference between the two chambers 20°C and the air debit constant. In the first part of this paper, a description of the hotbox machine, operation ranges and theoretical work principles of the hotbox are presented. Then, the second part shows the results for thermal test on the wall. The thermal test performed with the hotbox machine allow simulating environmental conditions accurately during in certain distance of cavity and in certain air debit. As a result, the configuration settings value at the hotbox machine have to correction to reach the temperature difference as planned. The temperature difference at beginning of the thermal tests on the wall is less than planed temperature difference. However, this correction value of temperature shows agreement result with the value 20°C in temperature different.