# NatLabRockies/EnergyPlus

EnergyPlus™ is a whole building energy simulation program that engineers, architects, and researchers use to model both energy consumption and water use in buildings.

Repository: https://github.com/NatLabRockies/EnergyPlus
Canonical: https://ross.abutalabs.com/products/energyplus
Homepage: https://energyplus.net
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-08-26T18:16:56+00:00

## Health v2 (maintenance only)
Score: 87/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 63, longevity 100
- inputs: {"age_days": 4667, "days_push": 7, "days_rel": 89, "gap_med": 101.0, "n_releases_24m": 7}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1559, forks 487 (observed 2026-08-28T04:05:03.681181+00:00)

## What it is
EnergyPlus is a whole-building energy simulation program that models energy consumption and water use in buildings. It is developed in C++ and used by engineers, architects, and researchers, with releases for Windows, Mac, and Linux.

## Use cases
- simulate annual energy consumption of a building design
- model HVAC system performance before construction
- estimate water use in a building
- compare energy efficiency of design alternatives
- run parametric energy simulations for research
- comply with building energy codes and standards

## When to choose
- you need rigorous, research-grade whole-building energy and water simulation
- you are an engineer, architect, or researcher modeling building performance
- you need a cross-platform simulation engine with APIs and extensive testing

## When to avoid
- you need a simple quick energy estimate rather than detailed simulation
- you want a graphical drag-and-drop modeling tool (EnergyPlus is primarily input-file/CLI driven)
- your domain is unrelated to building energy or water modeling

## Facets
- artifact type: application
- maturity: active
- function: simulation, cli, developer-tools
- domain: simulation, energy
- platform: windows, cross-platform, cpp
- tags: building-energy-modeling, hvac, water-use, physics-engine, engineering-simulation, engineering, linux, macos

## Member repositories
- NatLabRockies/EnergyPlus (main) score 87

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:03.681181+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:29:48.694407+00:00, confidence not recorded.
  - readme: https://github.com/NatLabRockies/EnergyPlus (fetched 2026-08-28T04:05:03.681181+00:00, sha 900cd02c50ee)
  - homepage: https://energyplus.net (fetched 2026-08-29T11:29:28.922562+00:00, sha 3ef2b87141b3)
- Data as of 2026-08-30T08:39:29.467469+00:00.