ENVIRONMENTAL TESTING MACHINE

PROBLEM TO BE SOLVED: To give artificial weather change to each thermostat with an atmosphere and a cycle according to a test condition, by centralizing the heat source for feeding to the plural thermostats to one spot, and executing separately cold switching control of each thermostat. SOLUTION: This testing machine is equipped with plural thermostats 2 composed by forming the inner surface with a panel 10 having excellent thermal conductivity, forming the outside with heat insulating material 11, and forming a circulation route 12 of heat medium between the outside and the inside except a door 9, a heat medium generation part 3 connected to the circulation route 12 through piping 5a, 6a, 7a, for supplying the heat medium set at different temperatures, and a control part 4 for controlling a cold cycle in each thermostat, switching of selector valves 19, 20 installed on the piping according to the set temperature, and a mixing ratio of the heat medium by a mixer 8.