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The article describes a specialized building information model implemented in a Matlab environment. It is designed to evaluate the energy efficiency of a building. It is supporting water, heat and electricity as resources consumed during the usage phase of a building. The danger of global warming, natural resources depletion and world ecosystem collapse currently is constantly increasing. When this happens 45% of world’s energy consumption, 65% of electric power, 40% of raw materials, building industry uses 14% of potable water supply. At the same time this industry provides 35% of all carbon dioxide emissions and almost half of all solid wastes. Therefore sustainability and energy efficiency development for buildings and structures is one of the main problems of modern building industry.

The complexity of modern design objects, especially automatic control systems (ACS), the constant tightening of requirements for projects, the very high price of erroneous design decisions are inconsistent with the traditional tools of technology and design. A way out is to develop and implement a new set of tools - tools of the designer - computer-aided design.

<p class="p0">Creating a comfortable indoor environment has been one of the mainconcerns when it comes to the design and operation of buildings. Buildings are a crucial part of our daily life, on average people spends 85 % of their time performing activities inside of buildings and therefore the quality of the indoor environment is a critical factor affecting the happiness and productivity of building users.The indoor environmental quality has a strong relationship on the thermal conditions of a space which is directly affected by the amount of heat lost or gained due to the properties of the materials used, the external environmental conditions and the inner sources of heat; In consequence, efforts have to be made to maintain proper thermal conditions by means of using natural and mechanical strategies to provide heating, cooling and ventilation. While the thermal comfort is an important aspect for the average user of a building, it becomes a critical aspect when it comes to population highly sensitive to thermal conditions.</p>