A simplified life cycle of any product or service consists of three main stages – manufac-turing, including obtaining, transformation, combination of raw materials; transportation, aswell as packaging; consumption from purchase up to actual use. Energy is not an exception,it is also an item offered by the market in different forms, and everyone in need of it has theright to buy it in case the price is acceptable. Heat power is one of the energy types requiredby households and important for proper maintenance. Without heating, as well as electricity,modern houses cannot function appropriately, are not attractive to their inhabitants, do notprovide comfort and safety. Nevertheless, heat power often is considered as a by-product ofelectricity production, nowadays a swift price increase for both types of energy is inevitable.Energy efficiency is the level of appropriate usage of energy resources, which can bedetermined as the relation between final product type, quality, quantity and consumption ofenergy necessary to create this product.Indirectly energy efficiency impacts health of the society in general and each individual inparticular. Renovated energy efficient apartment buildings have a better ventilation system andmicroclimate. The problem of moisture and mold is at least partly solved, comfort is reachedby consuming less energy, especially, heat power.The aim of the paper is to research the impact of different energy efficiency increasingmeasures on heat consumption in multi-apartment buildings.