As consisted with Directive No 3 of President of the Republic of Belarus of June, 14th 2007 ‘Economy and Husbandry – the Major Factors of Economic Security of the Republic of Belarus’, saving fuel-and-energy resources over the republic in 2010–2015 should amount to 7,1–8,9 MIO tons of fuel equivalent including 1,00–1,25 MIO tons of fuel equivalent at the expense of heat-supply optimization and 0,25–0,40 MIO tons of fuel equivalent at the expense of increasing enclosing structures heat resistance of the buildings, facilities and housing stock. It means, where it is expected to obtain around 18 % of general thermal resources economy in the process of heat-supply optimization, then by means of enhancing the cladding structure heat resistance of the buildings and constructions of various applications – only about 3–5 % and even a bit less so of the housing stock. Till 1994, in residential sector of the Republic of Belarus, the annual heat consumption of the heating and ventilation averaged more than 130 kW×h/(m2×year) (~56 %), of the hot-water supply – around 100 kW×h/(m2×year) (~44 %). In residential houses, built from 1994 to 2009, heat consumption of the heating and ventilation is already 90 kW×h/(m2×year), of the hot-water supply – around 70 kW×h/(m2×year). In buildings of modern mainstream construction, they expend 60 kW×h/(m2×year) (~46 %) on heating and ventilation and 70 kW×h/(m2×year) (~54 %) on hot-water supply. In some modern residential buildings with the exhausted warm air secondary energy resource utilization, the heating and ventilation takes around 30–40 kW×h/(m2×year) of heat. Raising energy performance of the residential buildings by means of reducing heat expenses on the heating and ventilation is the last segment in the system of energy resources saving. The first segments in the energy performance process are producing heat and transporting it over the main lines and outside distribution networks. In the period from 2006 to 2013, by virtue of the heat-supply schemes optimization and modernizing the heating systems using valuable (200–300 $US per 1 m) though hugely effective preliminary coated pipes, the economy reached 2,7 MIO tons of fuel equivalent. Heat-energy general losses in municipal services of Belarus in March 2014 amounted up 17 %, whilst in 2001 they were at the level of 26 % and in 1990 – more than 30 %. With a glance to multi-staging and multifactorial nature (electricity, heat and water supply) of the residential sector energy saving, the reasonable estimate of the residential buildings sustenance energy efficiency should be performed in tons of fuel equivalent in a unit of time.