Abstract. In all countries of the world, in particular Uzbekistan, special attention has recently been given to the issues of energy and resource conservation, environmental protection, and the search for alternative energy sources to replace traditional energy resources in the future. At the moment, there is intensive growth in the use of renewable energy sources, with solar energy and power plants based on solar energy being considered the main developing area. Solar systems can be used primarily in the country's southern regions, characterized by favorable climatic conditions, abundant sunny days, and high solar radiation intensity. The article discusses the study of heavy loamy soils, under the same conditions, the thermal conductivity is always lower than that of light and medium loamy soils. Thus, it is confirmed by the conducted experiments that the substrate layer 0-30 cm accumulates about the same amount of heat, and with increasing humidity, the thermal conductivity slowly grows.