Introduction
plugin for Grasshopper. Users often roll back to this version to avoid "PINVOKE" errors or compatibility issues found in version 3.0 and newer. Installation Path : On Windows, it is typically installed directly to C:\openstudio-2.9.1 openstudio 2.9.1
As of 2026, OpenStudio 2.9.1 is officially an end-of-life (EOL) version. NREL does not provide security updates or support for EnergyPlus 9.3.0. However, the building energy modeling community has established unofficial forums (especially on UnmetHours.com and the OpenStudio Google Group) where users actively share patches and measure scripts for 2.9.1. Introduction plugin for Grasshopper
Allowed users to establish high-level defaults for lighting, occupancy, and equipment based on ASHRAE templates. Thermal Zones: Where spaces were mapped to specific HVAC delivery zones. HVAC Systems: NREL does not provide security updates or support
Abstract
Brief background, objective, methods (model geometry, schedules, HVAC), key results (EUI, savings %), conclusion.
compliance. Through the "OpenStudio Standards" library, the software automates the creation of prototype models and performance ratings, reducing human error in regulatory filings. 4. Legacy and the Shift to 3.0
Released around late 2019, version 2.9.1 is a legacy but highly significant version in the building science community. It acted as the connective tissue between: