In this thesis, we analysed energy savings in five retirement homes in Slovenia which were renovated in 2012 and 2013. These took part in public tender for a complete energy renovation and were selected on the basis of point-system for measures from an extended residential energy consumption survey (RECS). The basis for comparison are the
calculations for the estimated consumption in RECS, which were prepared through joint venture withgGenera-Proplussby the Ministry for labour, family and social affairs in 2009.
Retirement homes chosen for the analysis have a simpler architectual plan and were willing to share the data on consumption of energy for study purposes. The thesis enables more detailed insight in the procedure composition and the content scope of extended RECS, with emphasis on the used methods for calculating building physics and authorial analysis brefore and after renovation. Savings for analysis were calculated wit a simplified method as well as with NovoCAD program tool, which is today considered outdated because of loose criteria and methods of calculation. The mesaure of success is valid agreement of calculated savings with actual savings. For this purpose, we made a control calculation of building physics with a newer program KI Energija and the results were compared with measured savings. With reproduced calculations we proved that the program is a better choice from viewpoint of accuracy. In the end of the analysis we calculated the level of success of the estimation of savings with Chi-squared test and T-test. All used methods proved to be statistically in agreement (even up to 91,4 %); the actual control calculations unfotunately did not show agreement of calculations with actual savings. We reached better agreement of calculated savings in control calculations with program KI Energija – statistically this one did not show agreement because the sample was too small.