3 versions of System Design Load are listed here, from April 17, 2025 to the current 6.4. Each one links to the publisher’s own installer files.
3 versions over 1 year · about 3 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 6.4Latest | April 22, 2026 | 148.0 MB | 64-bit EXE (Inno Setup) 148.0 MB |
| 6.3 | October 1, 2025 | — | 64-bit EXE (Inno Setup) |
| 6.2 | April 17, 2025 | — | 64-bit EXE (Inno Setup) Release notesSystem Design Load v6.2 contains the following changes:
1. Building Modeling
Added an “Import gbXML” option to facilitate integration between HAP and CAD or BIM tools.
2. Calculation Engine
Updated the calculation engine to EnergyPlus version 23.2 which resolves certain problems, updates calculations, and in some cases delivers a calculation speed increase.
3. Other Enhancements
Made other enhancements involving project data management, building modelling, space models, air systems, plants, and documentation.
4. Problem Fixes
Corrected problems in HAP v6.1.
Further information is provided in the SDL v6.2 New Features Document and in section 1.2 of the help system. |