Energy efficiency and renewable energy technology represent a team for solving energy and living questions more convenient and successful in future. Being able of affording enough energy services seems to become more and more luxury, which is tried to overcome by the development of the so called "energy independent building" or even the realisation of the "zero-energy-cost" House. State of the art building typology and the integration of energy efficient building technology in cooperation with renewable energy defines the framework of this Master thesis. It is evaluated on the technical and economical side, if it is possible to realise the aspired "zeroenergy-cost" House, by using a ground source heat pump and a photovoltaic system. The results show the clear tendency that from the technical point of view the combination of heat pump and photovoltaic is possible but energetically not feasible, if the heat pump is only used for heating. Whereas the economical results, with the applied calculation method of leaving out the investment costs, are very positive and verify the possibility of the "zeroenergy- cost" House. In summary it can be said that the "zero-energy-cost" house or "energy independent building" are a realistic solution for the actual energy discussion going on worldwide. The open question to be answered in the following years is a strategy for the successful and fast market introduction of these ideas.