| Summary: | When analyzing its property portfolio, the property manager Castellum AB noticed that the energy use of buildings with relatively large similarities could differ. In this case it concerned properties Bodarna 8 and Ölstånkan 14 in Örebro. The purpose of this work was to find out what the difference is due to and whether it was possible to reduce the difference with profitable energy efficiency measures. To solve this, previous studies concerning local buildings and handbooks on energy surveys and energy efficiency was studied. Then, an equation based on methods for determining energy use according to the legal requirements was constructed in Excel. And finally, models to calculate the profitability of the measures were created. The result showed differences in how the buildings are designed with different materials and how they are located, which probably affects the transmission losses of the buildings in different ways. Operation settings of the energy systems also contributed to the energy difference. Finally, it was noted that the buildings were below the average of 211 kWh/m2 within enclosing structural parts and year, for buildings in the same category. Ölstånkan nevertheless had a specific energy use, 116 kWh/m2, Atemp and year, that exceeded Bodarnas use of 86 kWh/m2, Atemp and year where energy for heating and estate electricity stood out. However, with proposed measures, it is possible to lower the specific energy of Ölstånkan to 65 kWh/m2, Atemp and year from 116 kWh/m2, Atemp and year while at the same time gaining profitability.
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