A human body thermal support device comprising: a base, a triple-walled wall mounted on the base, wherein the triple-walled wall comprises an inner wall, an outer wall, an intermediate wall therebetween, and an upper wall and wherein the inner wall and the outer wall are spaced apart from the intermediate wall so that between the inner wall and the intermediate wall a first space is formed, and between the outer wall and the intermediate wall a second space is formed, and wherein the first space and the second space are fluidly connected to each other through an opening in the intermediate wall so that a gas flow can flow from the first space to the second space, a gas flow preparation unit provided at the base, wherein the gas flow preparation unit is fluidly connected to the first space and the second space of the triple-walled wall by means of conduits (7;8), and wherein the gas flow preparation unit is configured to warm-up and direct said warmed gas flow to the first space and extract from the second space of the triple-walled wall; wherein one of the conduits (7;8) is fluidly connected to one of the spaces (4;5), and another conduit (7;8) is fluidly connected to another space (4;5) forming a continuous flow path from the gas flow preparation unit to the first space, through the opening to the second space and back to the gas flow preparation unit, as a result of which effective heating of the triple-walled wall is provided, wherein the first space is enclosed from all side by the base, the inner wall, the intermediate wall and the upper wall so that the gas does not escape it and is transferred only through opening in the intermediate wall to one of the conduits, and the second space is enclosed from all sides by the base, the outer wall, the intermediate wall and the upper wall so that the gas does not escape it and is transferred only through opening in the intermediate wall to one of the conduits. a base, a triple-walled wall mounted on the base, wherein the triple-walled wall comprises an inner wall, an outer wall, an intermediate wall therebetween, and an upper wall and wherein the inner wall and the outer wall are spaced apart from the intermediate wall so that between the inner wall and the intermediate wall a first space is formed, and between the outer wall and the intermediate wall a second space is formed, and wherein the first space and the second space are fluidly connected to each other through an opening in the intermediate wall so that a gas flow can flow from the first space to the second space, a gas flow preparation unit provided at the base, wherein the gas flow preparation unit is fluidly connected to the first space and the second space of the triple-walled wall by means of conduits (7;8), and wherein the gas flow preparation unit is configured to warm-up and direct said warmed gas flow to the first space and extract from the second space of the triple-walled wall; wherein one of the conduits (7;8) is fluidly connected to one of the spaces (4;5), and another conduit (7;8) is fluidly connected to another space (4;5) forming a continuous flow path from the gas flow preparation unit to the first space, through the opening to the second space and back to the gas flow preparation unit, as a result of which effective heating of the triple-walled wall is provided, wherein the first space is enclosed from all side by the base, the inner wall, the intermediate wall and the upper wall so that the gas does not escape it and is transferred only through opening in the intermediate wall to one of the conduits, and the second space is enclosed from all sides by the base, the outer wall, the intermediate wall and the upper wall so that the gas does not escape it and is transferred only through opening in the intermediate wall to one of the conduits.