The purpose of this study is to present the quantitative performance of the heat recovery & floor embedded ventilation systems which is energy saving ventilation systems. To present the quantitative performance needs to analyze the real energy consumption of the heating & cooling equipment. So, when operating the ventilation system, the study measured boiler energy consumption in heating season with large difference temperature between indoor and outdoor. The energy consumption per hour of the heat recovery ventilation systems was to be 1,392Wh/cycle(at outdoor temp. is 0℃), 1,973Wh/cycle(at outdoor temp. is -12℃), 2,299Wh/cycle (at outdoor temp. is -15℃). And then, The one of the floor embedded ventilation system was to be 2,040Wh/cycle(at outdoor temp. is 0℃), 2,747Wh/cycle(at outdoor temp. is -12℃), 3,292Wh/cycle(at outdoor temp. is -15℃). As a result of comparing two ventilation systems, The heat recovery ventilation system could save 84.06%(at outdoor temp. is 0℃), 80.91%(at outdoor temp. is -12℃), 78,18%(at outdoor temp. is -15℃).