Building energy modelling plays an important role in determining the energy performance of a building. In this paper, we compare monthly and hourly methods of building energy modeling on a selected office building, for which we were also provided with space heating and cooling energy use measurements. For the monthly method calculations, we use a software tool developed in accordance with the energy efficiency regulations, and for the hourly one, we use DesignBuilder, a software based on the EnergyPlus simulation tool. We found that both methods are suitable for determining space heating energy use. However, only the hourly method was found to be appropriate for determining space cooling energy use. We considered the inclusion of night ventilation to reduce cooling energy use and solar power plant to reduce electricity costs.
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