Abstract: This study presents results of heat-vacuum testing of an anthropomorphic robot. The data analysis obtained during the tests allows us to determine the main characteristics of means for ensuring a thermal mode. Possibility of continuous work under extreme operating conditions for a long period of time 1.5 h is demonstrated. Testing conditions in various modes are described as well as the robot placement on rigging in a camera. The system of a stand vacuum pumping is described. The method of external heat fluxes simulation and equipment used for this purpose are presented in detail. Thermal sensors and heaters layout is given. Temperature values at the beginning and ending of modes are presented. Graphs of temperature changes in the RAT construction are shown in various modes. Pictures of the robot in the thermo-pressure chamber are presented before and during testing.