The paper is aimed at studying efficiency of learning languages by pre-school children. Different types of memory that are at high level of its development at this age promote children's abilities to acquire languages. Also psychologically, pre-school children are fit to develop speech and communication skills by using adequate materials and tasks. A set of criteria are evaluated to introduce socio-cultural content for promoting effective language learning

The article deals with the energy savings analysis during operation of buildings, provides the heat balance of residential premises, considers options for energy-efficient solutions for hot water supply systems in buildings. As technical facilities that allow the use of secondary heat sources and solar energy, there are also considered the systems with heat recovery of "gray" wastewater, heat pumps, solar collectors and photoelectric converters.

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