Är det lönsamt att energieffektivisera en 1800-talsbyggnad?

Sammanfattning: The purpose of this master thesis was to examine what kind of energy efficiency measures that could be applied on older buildings and whether they could be profitable investments. In order to be able to calculate the relative energy saving effect of the measures, a specific building has been chosen, located in Malmö, southern Sweden and was built in the 1880. Different kind of energy efficiency measures for this building were selected and then the energy savings and profitability were calculated for each measure. A combination of measures with the highest possible profitability was presented in the end. They are the following, listed in decreasing profitability: 1. Change of traditional light-bulbs to LED-lights 2. Change of ventilation system to a more efficient one 3. Change from a centralized domestic hot water system to a decentralized one 4. Additional internal insulation 5. Change of windows The measures gave a total energy savings of 440 kWh/m2, which meant a 78% lower energy consumption for the current building. The internal rate of return showed 34%. Based on our research and calculations there is a huge economical potential in refurbishing older buildings in an energy efficient way. Our findings in this report could serve as an inspiration for similar projects with the same ambitions.