Environmental Conditions Tests in the Operator Section TS ISO 10263-4 This standard specifies a test method that provides constant measurements of temperature and humidity in the operator compartment of construction and excavation machines equipped with air conditioning, heating and/or ventilation devices. It aims to observe and report the effects of air conditioning and heating within the operator enclosure under certain environmental conditions. Defines the test method used to measure the contribution of a heating, air conditioning and air conditioning system operating in a specific environment to the ambient temperature within the operator enclosure. The climatic environment inside the operator enclosure may not clearly correspond to this method. Minimum performance levels are determined for the heating, air conditioning and air conditioning systems of the machine's operator cabin and the operator cabin is subjected to these tests.