The goal of the book is to achieve energy savings and more.The building directly intervenes in the environment by requiring large amounts of energy, both during its construction / renovation and during its operation.The "shell" of the building, ie its outer casing, is the main factor regulating the energy loss during its operation, since it is necessary to create a constant temperature of about twenty-two degrees Celsius. However, the temperature of the outside environment is not constant and ranges from -55 to +55 degrees Celsius.To isolate the interior of a home from the outside environment, we need to create a strong outer casing, a shell that will prevent / isolate the outdoor temperature from inside the building. and this is achieved by making the shell with materials that resist the transfer of energy. The transfer of energy is transferred from one body to another through conductivity, air and radiation. And the rate of this transfer, depending on the material we use in the building shell, can be up to 7,000 times higher.Thus, if the building materials of the shell have a low coefficient of thermal conductivity, the improved building requires less energy expenditure in order to achieve the ideal human living temperature which is about 22o C.We can have heat losses from the frames due to the air passing through the joints of the frames or even from hygroscopicity, vapor permeability, the existence of capillaries and the water absorption of the shell of the mansion. However, the basic rate of loss of the shell of the mansion depends on the composition of the building materials of its shell. Why, there are materials that transfer up to two thousand times faster temperature inside the building than an insulating material.This is clear from the following indicative values of the coefficient of thermal conductivity in materials that are: Copper: λ = 284Aluminum: λ = 204Cast iron and steel λ = 58Brass λ = 54Solid stones: λ = 3 (W / m * K)Concrete: λ = 2Cement mortar: λ = 1.4Solid bricks: λ = 1Plasters λ = 0.87Glass λ = 0.82Bricks with straw λ = 0.70Cement. with lime. Inert λ = 0.70Cement blocks with gaps λ = 0.50Bricks λ = 0.46Bricks with the coating λ = 0.52Synthetic - asphalt λ = 0.20Wood (oak, beech, pine) λ = 0.16Plywood λ = 0.14Thermal insulation materials λ = 0.04Therefore, if a building shell is made of copper (example) it will have in relation to the shell of the improved building that is made of thermal insulation materials, 284 / 0.04 = 7,100 times more heat losses !!!!.So when will we have better homes?And of course, when we have in addition to the excellent architecture, decoration, functionality, the most important in all of us ecological protection of our planet.Both during the construction of the building and during its operation, significant amounts of energy are required that burden the cost of the building and do terrible damage to the planet. Therefore, the main purpose of a future building, in addition to the very good architecture, functionality, aesthetics and decoration, should be: - The minimization of energy quantities during the construction of the building.- The zeroing of quantities of energy to achieve ideal living conditions in the building.