In this masters thesis, a heat load calculation and heating system design for a family house have been carried out. The family house, with an area of 265 m², is located in Đakovo. The living area is divided into several different zones, and a technical drawing shows the layout of the rooms in the house and the pool area. The heat loss calculation was conducted according to the HRN EN 12831 standard. Using this standard, the heat load values for each individual zone were calculated, which needed to be covered by an appropriate heating system. For the heating system of the family house, underfloor heating was chosen, along with the additional use of radiators. The underfloor heating calculation was dimensioned using the IntegraCAD program based on the previously calculated heat losses. The project solution includes a suitable 11 kW heat pump with a corresponding secondary pump and a domestic hot water system. The arrangement and installation of the selected equipment are illustrated in a technical drawing. A calculation of the pool equipment is necessary for safe and efficient use of the pool throughout the year. The selection of an appropriate filter and circulation pump is crucial for maintaining water cleanliness and quality, while the selection of ventilation and water heating systems is necessary to create a comfortable microclimate in the pool area.