Building energy modelling should be use from project inception to construction. BEM should be the centre of an integrative building process in order to reach higher building energy efficiencies. Chaac Simulaciones Inc offers the following services: - Whole building simulation for Green Building Certification (LEED, BREEAM, DGNB, Well) - Documentation for LEED certification PIFs, prerequisites, and credits - Advanced HVAC design and sizing based on accurate heating/ cooling loads - Optimizing Energy Efficiency of building’s operation - Wind pressure loads calculation for building structure optimization (CFD and FSI) - Interior and exterior thermal comfort (CFD) - Improving interior acoustic or reducing exterior noise using CFD - CFD modeling of pollutant and smoke dispersion (Parking, operating rooms, smoking areas) - Passive Methods application to reach Net-Zero carbon (NZEB) - Dynamic Climate-based daylighting and glare modeling - Building Life cycle assessment (LCA) and life cycle cost (LCC) analysis