In the diploma thesis, based on the existing condition of the family house, an energy renovation was made. The house consists of three floors (basement, ground floor and attic). The house was built in 1997 and decorated and moved in in 2014 on the ground floor, when PVC doors and windows were installed and the floors were minimally thermally insulated. The energy renovation additionally insulated the mezzanine structures towards the basement and the attic, the external walls were thermally insulated and the facade was made, the carpentry in the basement was changed, the roof was insulated and the attic was arranged for living. Based on the new condition of the house, three heating and domestic hot water systems were considered, as well as the electricity supply system of all consumers in the house and electric car chargers (including thermotechnical installations) in order to meet energy consumption requirements in zero energy buildings. The first considered system is a system with a heat pump with underfloor heating as heating bodies or radiators, the second system is with an electric boiler as a heat generator and underfloor heating or radiators as heating bodies, while the third system is with a pellet boiler and underfloor heating and radiators as heating bodies. All three systems were considered for four insulation thicknesses of the outer walls of 8, 10, 12, and 15 cm. The considered electricity supply system is a classic networked system, where the surplus of produced electricity is sold to the electrical distribution network, but the deficit is bought from the grid. After economic analysis in year zero and after 20 years, a system with a pellet boiler and radiators with thermal insulation of the outer walls of 15 cm is chosen.