The paper explains a term of “solar thermal modernization” in the introduction, the term which bases mainly on acquiring and maximal utilization of the solar energy in active and passive systems. The proposal of its utilization in a single-family building was presented, consisting in putting of the optimal solutions into an architectural design, the solutions connected to a house shape, layout of rooms and functional connections, elements of a building structure, its location on the plot with the solution of surroundings and technical equipment. Finally, there was proved that the energy demand diminishes thanks to the applied elements of the thermal modernization.

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