TRACE 3D Plus software is built on the Department of Energy’s EnergyPlus calculation engine, allowing users to create more accurate and credible building models. The intuitive interface uses drag-and-drop components and 2D or 3D visual model validation. The software integrates component and system sizing with energy and economic analysis, allowing user movement from project plans and files to design and energy analysis without entering data multiple times. An extensive built-in library and expanded building templates assist model creation. Trane Official Product Selection System (TOPSS) software is integrated to provide comprehensive analysis for HVAC system design.