Openstudio 2.9.1 |link| Jun 2026

: Upgrade to 3.x if you need Python scripting, advanced HVAC (like variable refrigerant flow / VRF), or latest code compliance. Stay on 2.9.1 if you work in a team with legacy models, prefer SketchUp 2021, or need a rock-solid simulation for a project that must match a previous baseline.

Developed primarily by the National Renewable Energy Laboratory (NREL), OpenStudio is not a standalone simulation engine. Instead, it is an open-source Software Development Kit (SDK) and middleware that sits on top of EnergyPlus openstudio 2.9.1

developed by the National Renewable Energy Laboratory (NREL). It is a cross-platform software toolkit used for building energy modeling (BEM) that works in conjunction with EnergyPlus 9.2.0 Key Usage Contexts Honeybee Legacy Compatibility : Upgrade to 3

OpenStudio 2.9.1 is a highly specific "timestamp" in the evolution of building science software. To use it effectively or understand legacy models built with it, you must understand its compatibility matrix: Compatible Version / Standard Release Date December 7, 2019 EnergyPlus Version Radiance Version Ruby Version SketchUp Compatibility SketchUp 2017 🚀 Key Features & Workflow in 2.9.1 Instead, it is an open-source Software Development Kit

Even as newer versions of OpenStudio (3.x and beyond) have been released, 2.9.1 remains relevant for several reasons: