It is a fact that people spend almost 90% of their lifetime indoors, so the appropriate air temperature, humidity and the quality of air in the buildings are critically important to our health. Our aim is to create a comfortable living/working place environment while designing the sustainable engineering systems of HVAC. We create 3D HVAC systems, so the project looks as realistic as it appears after installation. BIM allows us to join the project design team, co-ordinate it and work together despite the distance. Nowadays there is a significant amount of different HVAC solutions for buildings and it is Mepco’s responsibility to find the best suitable one for a particular building.