Space simulator (1) comprising at least one simulation room (2) and adjusting means (3) to adjust one or more thermodynamic parameters present in said room (2), said adjusting means (3) comprising a circuit (4) for circulating a pressurized gas (G), wherein said circuit is provided with at least one heat exchanger (5) for the heat exchange between said gas and said simulation room (2), with at least one compressor (6) for circulating gas (G) in said circuit and with a device (7) for reaching, at least during transient state conditions, or maintaining constant, at least in the steady-state condition, a predetermined temperature (T) of the gas (G) circulating in said circuit, said predetermined temperature being selected from a plurality of temperatures, characterized in that the density (d) of the gas (G) circulating in said circuit (4), at least in the steady-state condition, is kept constant and is comprised between 8 and 15 Kg/m3.
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