This paper describes the evaluation of different improvement possibilities of a single family house on the Hungarian climate. Cost of Conserved Energy and Cost of Comfortable Hours of the active and passive energy saving measures are compared by means of a building energy modelling (BEM), using IDA ICE, and investment cost estimations. The methodology applied includes the following steps: 1. selection of a typical, single family house, designed in accordance with the Hungarian regulations; 2. BEM 3. changing and adjusting parameters of the building one by one in accordance with the defined improvement measures; 4. evaluation of the results in order to determine the exact percentage of investment cost increase, indoor comfort improvement and energy savings in case of each parameter; 5. determination of the most effective measures. The main goal of this research paper is to assess the effect of the relevant building improvement measures and to determine the most effective ones that may help architects during the design process in order to design single family houses in a more energy and cost efficient, environmentally-friendly way.
