NatLabRockies/EnergyPlus

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

Stars: 1.6k
Forks: 490
Open beginner issues: 0
Indexed issues: 812
Avg merge: 6d 21h
Merged PRs (30d): 22

Dominant language: C++
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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812 open issues indexed

Fan:SystemModel ignores Night Ventilation Mode Flow Fraction Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 62/100

NatLabRockies/EnergyPlus#11798 · 3 comments · Opened Sep 18, 2026
Windows arm64 release build broken due to Cmake detection of Fortran compiler on Github Actions Open

Defect Developer Issue

NatLabRockies/EnergyPlus#11797 · 1 assignee · Opened Sep 18, 2026
Documentation Issues - Running list Open

Defect Documentation

NatLabRockies/EnergyPlus#11783 · 1 comment · 1 assignee · Opened Sep 4, 2026
VAV terminal warns that an ignored minimum-flow field "will be ignored" even when the field carries no user intent (0 or Autosize) Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11771 · 1 assignee · Opened Aug 31, 2026
HeatPump:PlantLoop:EIR - calcPowerUsage uses load-side heat transfer instead of reference capacity Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11764 · 1 comment · 1 assignee · Opened Aug 21, 2026
Happy Name-iversary, EnergyPlus! Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

NatLabRockies/EnergyPlus#11760 · 4 comments · 3 reactions · Opened Aug 20, 2026
Inconsistent Kiva soil defaults Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NatLabRockies/EnergyPlus#11748 · Opened Aug 15, 2026
epJSON Schema should encode Yes/No fields as an actual JSON boolean rather than a string enum Open

Triage UnconfirmedDefect

Difficulty 3/5 1-2 days Newbie friendliness 55/100

NatLabRockies/EnergyPlus#11740 · Opened Aug 11, 2026
Erratic unitary system control with MultiSpeed coil and economizer Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NatLabRockies/EnergyPlus#11734 · Opened Aug 7, 2026
RoomAir:TemperaturePattern:UserDefined with RoomAirModelType=Mixing causes return air temperature to use default 23°C Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11719 · 1 assignee · Opened Aug 1, 2026
`CalcCoordinateTransformation` sometimes fails unpredictably on very thin horizontal surfaces Open

NewFeatureRequest Triage

Difficulty 3/5 1-2 days Newbie friendliness 68/100

NatLabRockies/EnergyPlus#11707 · Opened Jul 23, 2026
Enhance EMS to Handle Inside and Outside Face Absorptances Open

Defect NewFeatureRequest

NatLabRockies/EnergyPlus#11688 · 2 comments · 1 assignee · Opened Jul 14, 2026
Inheritance and shadowing issues in HeatPumpAirToWater Open

Defect

Difficulty 4/5 3-5 days Newbie friendliness 50/100

NatLabRockies/EnergyPlus#11685 · 2 comments · Opened Jul 10, 2026
CMake refactor parent issue Open

Developer Issue DoNotPublish

NatLabRockies/EnergyPlus#11682 · 1 assignee · Opened Jul 10, 2026
Documentation Issues 2026A Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11661 · 1 assignee · Opened Jun 26, 2026
Dehumidifier RH setpoint not well met (zone RH oscillations/spikes) Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NatLabRockies/EnergyPlus#11657 · 4 comments · Opened Jun 25, 2026
Support DX hot-gas reheat recovery up to 90% for CEH integrated HVAC/dehumidification systems Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11606 · 3 comments · Opened May 27, 2026
Variable Speed Pump and Two-way Common Pipe Causes Hard Crash Open

Defect

NatLabRockies/EnergyPlus#11599 · 2 comments · 1 assignee · Opened May 21, 2026
Differences in MRT between EnergyPlus version 9.4 and version 22.1 Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NatLabRockies/EnergyPlus#11591 · 6 comments · Opened May 18, 2026
Set up `Fan:SystemModel` overall system RTF output variable Open

NewFeatureRequest Triage

NatLabRockies/EnergyPlus#11577 · 1 reaction · 1 assignee · Opened May 5, 2026
Update/allow latent degradation model for cycling fans Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 32/100

NatLabRockies/EnergyPlus#11574 · Opened May 4, 2026
Add an end-use subcategory field to the WaterHeater:HeatPump:PumpedCondenser & WrappedCondenser objects Open

IDDChange NewFeature Triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

NatLabRockies/EnergyPlus#11559 · Opened Apr 30, 2026
EMS rated-capacity override is not fully implemented for multi-speed DX coils (Coil:Cooling:DX:MultiSpeed, Coil:Heating:DX:MultiSpeed) Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NatLabRockies/EnergyPlus#11534 · 1 comment · Opened Apr 17, 2026
Clean up dead branches caused by hard-coded local flags Open

Defect UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 52/100

NatLabRockies/EnergyPlus#11533 · 2 comments · Opened Apr 17, 2026
Is `init_state()` a fool's errand? Open

Refactoring

Difficulty 5/5 Over a week Newbie friendliness 28/100

NatLabRockies/EnergyPlus#11521 · 1 comment · 1 reaction · Opened Apr 13, 2026
HeatPump:AirToWater has higher pump energy usage than chiller with similar cooling rate Open

Triage UnconfirmedDefect

Difficulty 5/5 Over a week Newbie friendliness 28/100

NatLabRockies/EnergyPlus#11520 · Opened Apr 13, 2026
Demand columns blank in EAp2-4/5 Performance Rating Method Compliance LEED Summary report Open

Triage UnconfirmedDefect

Difficulty 3/5 1-2 days Newbie friendliness 48/100

NatLabRockies/EnergyPlus#11507 · 2 comments · Opened Apr 8, 2026
Correct Scalable Sizing Input Issues Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11465 · Opened Mar 13, 2026
Feature Request / Discussion — ZoneList Support as Key Value in Output:Variable and Meter:Custom Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 38/100

NatLabRockies/EnergyPlus#11436 · 5 comments · Opened Feb 26, 2026
Liquid-Cooled Data Centers / IT Equipment Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

NatLabRockies/EnergyPlus#11408 · 2 comments · 6 reactions · Opened Jan 29, 2026
Create HVACTemplate:Plant:HeatPump or HVACTemplate:Plant:HeatPump:ObjectReference Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11406 · Opened Jan 27, 2026
Allow input fields to be numbers OR schedules Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11403 · 1 comment · 1 reaction · Opened Jan 22, 2026
Add Space Type Table to LightingSummary and New Tables by Tag Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11402 · Opened Jan 22, 2026
Allow Meter:Custom to reference other Meter:Custom objects Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

NatLabRockies/EnergyPlus#11400 · 1 comment · 1 reaction · Opened Jan 20, 2026
Explicit Tankless Water Heater Model Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11399 · 1 comment · 2 reactions · Opened Jan 20, 2026
Allow sub-timestep DHW draw events (for HPWHs) Open

NewFeatureRequest Triage

Difficulty 5/5 Over a week Newbie friendliness 30/100

NatLabRockies/EnergyPlus#11398 · 2 reactions · Opened Jan 20, 2026
Allow schedules to be used for water heater deadbands Open

NewFeatureRequest Triage

Difficulty 4/5 3-5 days Newbie friendliness 38/100

NatLabRockies/EnergyPlus#11397 · 2 comments · Opened Jan 20, 2026
Add instructions on how to communicate objections to deprecation strategy Open

Triage UnconfirmedDefect

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

NatLabRockies/EnergyPlus#11379 · Opened Dec 18, 2025
UnitarySystem with Coil:Cooling:WaterToAirHeatPump:EquationFit as DOAS produces coil not found fatal error Open

Triage UnconfirmedDefect

Difficulty 3/5 1-2 days Newbie friendliness 48/100

NatLabRockies/EnergyPlus#11378 · Opened Dec 18, 2025
Update boost libraries used in Kiva; minimize interdependencies within boost usage Open

NewFeatureRequest Triage

NatLabRockies/EnergyPlus#11369 · 1 assignee · Opened Dec 12, 2025
Zone Multipliers and Ambient Temperature Zones Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11365 · 2 comments · 1 assignee · Opened Dec 12, 2025
Inconsistent Results When Using Site:VariableLocation with Fenestration Surfaces Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11353 · 2 comments · 1 assignee · Opened Nov 25, 2025
Add exterior surface LWR exchange with surrounding surfaces to HAMT heat balance algorithm Open

NewFeatureRequest Triage

Difficulty 4/5 3-5 days Newbie friendliness 30/100

NatLabRockies/EnergyPlus#11318 · Opened Nov 3, 2025
Mixing Airflow Stats Nominal table and Zone Multipliers Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NatLabRockies/EnergyPlus#11317 · Opened Nov 3, 2025
Significantly higher chiller energy use in v25.1 for primary-secondary common pipe and branch pumps Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 32/100

NatLabRockies/EnergyPlus#11308 · 2 comments · Opened Oct 29, 2025
AirConditioner:VariableRefrigerantFlow Heat Recovery Mode Temperature Boundaries Open

Triage UnconfirmedDefect

NatLabRockies/EnergyPlus#11303 · 1 assignee · Opened Oct 28, 2025
Odd DOAS Controllers Open

UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11291 · Opened Oct 24, 2025
AirLoop Coil Sizing is based on some Ideal Conditions and not the Design Day Conditions Open

Triage UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NatLabRockies/EnergyPlus#11264 · Opened Oct 9, 2025
Solar Shading Unit Tests Failing Open

Defect UnconfirmedDefect

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NatLabRockies/EnergyPlus#11258 · 1 comment · Opened Oct 6, 2025
Spawn Helper Functions Open

NewFeatureRequest

Difficulty 5/5 Over a week Newbie friendliness 25/100

NatLabRockies/EnergyPlus#11238 · Opened Sep 30, 2025

NatLabRockies/EnergyPlus

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