The era of technological progress provides people with many opportunities to install in a building various systems such as heating, gas supply and ventilation that will help to improve the microclimate and comfort of use of the room. The environmental and economic side of these systems remain the main issues in selecting the type of installation. The article considers the energy efficiency of a heating system using a solar window. The data describes changes in the solar window heat carrier temperature and the nature of the change in thermal power over time. It was found that the proposed solar window model is quite effective and can be used in the design of of solar heating systems. The results of the study can be used in the design and choice of location of solar energy installations in Ukraine.