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The control industry integrates more and more recent innovations, especially on the sector of communication networks (bus), control (fuzzy logic, neural networks…) and informatic (hard-and software) for the development of Building Management Systems (BMS). The necessity of innovation on this field imposes on the control industry to develop faster and faster new products while managing perfectly the quality of the products. To date, many field tests are carried out in order to make sure the correct function of the product under different conditions. An adapted approach for this problem is the use of a virtual laboratory. It reduces also the necessary time for field tests that are long and expensive. In this paper the advantages of this way to develop new products are shown. Two general structures f the virtual laboratory in the graphical simulation environment are compared adapted to the use for product development. These structures enable the user to study the control of different HVAC systems in buildings by simulation or by emulation.