Increasing prices for limited fossil resources as well as the increase of CO₂ emissions and the serious consequences of global warming require a more efficient use of energy. The innovative heating and cooling system of Hippokrates GmbH (the “Hippokrates-System“) offers as solution of such requirement a system for CO₂-neutral heating as well as cooling with the potential of saving up to 90% energy costs which by the same token provides a healthy and comfortable room climate because of the application of a permeable inside insulation plaster which is by no means inflammable.