Abstract: The thermal insulation of buildings is realized by the diffused reflection of thermal radiation and the diffused reflection of the thermal transition of the air, from the internal and the external surfaces of the sublayers of the external masonry, the external roofs, the internal masonry and the internal ceilings of the buildings. Thermal insulation is also realized by a low emission of thermal radiation, with the diffused reflection of thermal radiation and the diffused reflection of thermal transition of air, from the internal surfaces of a parallel plane division having an enclosed layer of air, which is surfaces of a parallel plane division having an enclosed layer of air, which is constructed at the internal side of the sublayers of the external masonry and the external roof of the buildings. These surfaces are covered with a reflective insulating material, which can be colored with the addition of coloring pigments.