The basic benefits of low-temperature radiant heating systems are the better indoor air quality, thermal comfort and the lower exploitation costs. Additional sound insulation and high inertia factor that provides heating of the surfaces, even without initial phase of energy consumption can be regarded as an advantage. This paper presents benefits of low temperature systems installed under the floor or wall surfaces in comparison with classic heating systems. This study is aimed to demonstrate the influence of heating system elements on indoor air parameters especially on internal surface of building envelope. The model described in this paper offer to optimize building energy performance with low temperature pipes built-in construction.