Older buildings often do not meet modern legislative requirements and energy standards, which results in high energy consumption, increased use of fossil fuels, and consequently higher greenhouse gas emissions. Instead of demolition and reconstruction, energy renovation presents a sensible solution. It includes improvements to the thermal envelope, replacement of building fixtures, modernization of the heating system, and the use of
renewable energy sources. This thesis examines an older residential building located in a small village above Koper. Using available software tools, an initial analysis of the existing condition was conducted. Based on the results, appropriate renovation measures were determined, followed by a new simulation to assess the improvement in energy efficiency. We analyzed the impact of three renovation measures: enhancement of the thermal envelope, replacement of the heating system, and installation of a solar power plant. In the final part, we compared the primary energy consumption before and after the renovation and evaluated the viability of the investment based on the estimated payback period. Our findings demonstrate that the selected combination of measures leads to a significant reduction in energy consumption and CO₂ emissions.
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