the element 1 is rising the heat in the building interior is flowing out through the wall 6 and assembly to the exterior atmosphere heat flowing from the interior provides the heat to raise the temperature level of the wall 6 as a result of the escalating temperature level of the element 1 within the assembly the rate of heat flow from the interior to the exterior is reducing as a result of the declining thermal gradient between the interior and the element 1 when the temperature of the wall 6 the inner layer 4 and the element 1 equalise with the temperature of the building interior a neutral thermal gradient is produced as a result of the neutralisation of the thermal gradient between the interior and the element 1 the outflow of heat from the interior of the building through the wall 6 and into the inner layer 4 of the assembly is prevented likewise heat from the element 1 is prevented from flowing through the inner layer 4 to the wall 6 and thus the electrical energy being supplied to the element 1 provides no heating through the wall 6 to the building interior heat is flowing from the element 1 and the thermal conductor 2 and out through the outer layer 5 and cladding 7 to atmosphere whenever the heat of the element 1 and conductor 2 is influenced by a negative thermal gradient to the exterior atmosphere in this way a.