In this paper we have presented how to do a calculation of the energy consumption with the dedicated tools. For understanding, we first presented the theoretical foundations and current guidelines of the European Union in the field of energy use in residential buildings. Then with using the DesignBuilder and URSA4 programs, we made a calculation according to monthly and hourly method, which we finally compared with each other as well as with the actual data of the existing house. We found that the hourly method is more suitable for calculation of energy use for heating and is reasonable to use it, if we have enough data and if we want the most accurate results.
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