Due to the growing problem with pollution has European Union committed to reduce the amount of emissions of greenhouse gasses. Big amount of them is being produced as a result of inefficient use of energy. As a member of EU, Slovenia is pursuing reduction of total energy consumption as well. For this reason, we have as a project of our thesis chosen the business building TR3, which is located on the Republic Square in Ljubljana. Using the programs DesignBuilder and EnergyPlus, we have calculated the required power of the chiller, the benefit of its potential substitution with the new one and the measures for reduction of total energy consumption. In the second section we have implemented three measures and have hereinafter reviewed their efficiency. Results have shown that with the use of these regulations we can more or less reduce the use of heating and cooling energy. At the end of thesis, we have calculated profitability of the regulations and payback period of the investment. We have concluded that the investment into regulations would not be fast repaid, nevertheless would the building be more energetically efficient and its environmental impact would be lower.
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