At the beginning, the history of the house was described from the first existing house to the later renovated family house. Then, according to the adaptation project, a model was made in the SketchUp software and the walls were defined in it. The model was introduced into the TRNsys software where the structure and property of the walls were defined. Next, it was necessary to balance the system by obtaining from the results of the simulation an efficient heating energy that had to be approximate to the final energy of the gas for heating the family house. After balancing, the existing system of heating and DHW system with gas, the result of primary energy consumption was obtained almost equal to the consumption of primary energy of gas. Thus, the existing system in the simulation is balanced and can be further improved. The selection of air – water and water – water heat pumps followed, and the new system was installed in the existing one by replacing these devices for gas system in the simulation. After that, a set of photovoltaic panels were selected that would be on the roof of the house and supply electricity to the heat pump during operation, while the rest would be delivered back to the grid. Upon completion of the simulations, it was conducted in economic analysis and observation of the cost-effectiveness of the system, where the system is profitable if it is connected to photovoltaic panels and the delivery of electricity back to the network.