The aim of the work is to explore suitability of Latvian environment to the usage of solar collectors system. For the attainment of objective monotype house will be modeled, the house will be equipped with the combined solar heat system, which will be placed in different regions. There is diverse amount of sunny days in different regions, as well as diverse average temperature, wherewith the amount of heat differs. For the modeling of building, modeling program PolySun 3.3. model of solar collectors will be used, which is provided for several solar heat systems, inter alia for the calculation of combined solar heat supply system and for the solving of several relevant tasks. After data inputting, program can model locality individualities of solar heat supply system and can consider them while simulating activity of modeled system. Wherewith results are achieved, after analysis of results it is theoretically possible to clarify suitability of specific system to specific place.