NatLabRockies/OpenStudio-HPXML

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• Update documentation when we model induced infiltration

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  Difficulty 2/5 1-3 hours Newbie friendliness 66/100

  NatLabRockies/OpenStudio-HPXML#2284 · Opened Oct 20, 2026

• Model non-constant duct leakage fraction?

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

  NatLabRockies/OpenStudio-HPXML#2281 · Opened Oct 13, 2026

• Model duct losses during system off time

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  Difficulty 5/5 Over a week Newbie friendliness 15/100

  NatLabRockies/OpenStudio-HPXML#2280 · Opened Oct 13, 2026

• Improve duct conduction losses as a function of HVAC capacity

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  Difficulty 5/5 Over a week Newbie friendliness 18/100

  NatLabRockies/OpenStudio-HPXML#2279 · 1 comment · Opened Oct 13, 2026

• In line showers

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  Difficulty 3/5 1-2 days Newbie friendliness 50/100

  NatLabRockies/OpenStudio-HPXML#2276 · Opened Oct 6, 2026

• Building UA/TC and BLC outputs

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

  NatLabRockies/OpenStudio-HPXML#2275 · Opened Sep 30, 2026

• Add optional bool argument for advanced HVAC timeseries outputs

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  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  NatLabRockies/OpenStudio-HPXML#2274 · Opened Sep 29, 2026

• Update soil density/specific heat for Kiva?

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

  NatLabRockies/OpenStudio-HPXML#2258 · Opened Aug 15, 2026

• Support air-to-water heat pumps serving space conditioning and DHW (multifunction / combi heat pump)

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

  NatLabRockies/OpenStudio-HPXML#2238 · 3 comments · Opened Jul 13, 2026

• Collapse like HVAC systems

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  performance

  Difficulty 5/5 Over a week Newbie friendliness 45/100

  NatLabRockies/OpenStudio-HPXML#2236 · Opened Jul 10, 2026

• Add support for powered attic ventilation fans in HPXML/OpenStudio-HPXML

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

  NatLabRockies/OpenStudio-HPXML#2230 · 1 comment · Opened Jun 25, 2026

• Possible HPWH warnings

  May be free again @jmaguire1 claimed this 138 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#2227 · 1 assignee · Opened Jun 4, 2026

• Update to SEDS 2025 data

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

  NatLabRockies/OpenStudio-HPXML#2218 · 2 comments · Opened May 12, 2026

• Move the DHW parasitics to an EMS program

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

  NatLabRockies/OpenStudio-HPXML#2202 · Opened Apr 28, 2026

• Add new `Load: Heating: Heat Pump Defrost Backup` output?

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

  NatLabRockies/OpenStudio-HPXML#2179 · Opened Mar 23, 2026

• Misc areas to allow more flexibility

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

  NatLabRockies/OpenStudio-HPXML#2170 · Opened Mar 2, 2026

• Incorporate codes/programs in BuildResidentialHPXML measure

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

  NatLabRockies/OpenStudio-HPXML#2168 · 2 comments · Opened Feb 27, 2026

• Allow specifying which loads are critical for backup power

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  enhancement priority low

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

  NatLabRockies/OpenStudio-HPXML#2159 · Opened Feb 3, 2026

• Improved buried duct model

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  NatLabRockies/OpenStudio-HPXML#2142 · Opened Jan 9, 2026

• Ground reflectance

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  NatLabRockies/OpenStudio-HPXML#2134 · Opened Jan 6, 2026

• Support new "not present" choices in latest HPXML version

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

  NatLabRockies/OpenStudio-HPXML#2127 · Opened Dec 23, 2025

• Further disaggregate airflow outputs in timeseries and component loads

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

  NatLabRockies/OpenStudio-HPXML#2118 · 2 comments · Opened Dec 9, 2025

• Parallelize unit tests

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  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  NatLabRockies/OpenStudio-HPXML#2114 · Opened Dec 5, 2025

• Allow MF locations for battery location

  May be free again @shorowit claimed this 328 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#2104 · 2 comments · 1 assignee · Opened Nov 26, 2025

• Component loads -- internal gains vs surfaces

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

  NatLabRockies/OpenStudio-HPXML#2097 · 1 comment · Opened Nov 19, 2025

• Clothes dryer venting hours assumption

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

  NatLabRockies/OpenStudio-HPXML#2095 · 1 comment · Opened Nov 13, 2025

• Heat Pump Water Heater (HPWH) Interaction Factor

  May be free again @jmaguire1 claimed this 359 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#2090 · 1 comment · 1 assignee · Opened Oct 27, 2025

• Support `Count` input for appliances

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  NatLabRockies/OpenStudio-HPXML#2071 · Opened Sep 4, 2025

• BuildResidentialHPXML: Cathedral ceilings

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

  NatLabRockies/OpenStudio-HPXML#2044 · Opened Jul 23, 2025

• Replace `HPXML::has_fuels` with `FuelTypesAvailable` defaulting

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  priority low refactor

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

  NatLabRockies/OpenStudio-HPXML#2027 · Opened Jun 18, 2025

• Electric Panel Follow-up Issues

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

  NatLabRockies/OpenStudio-HPXML#2008 · Opened May 12, 2025

• Misleading gallons of hot water output (HPWHs)

  May be free again @shorowit claimed this 545 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#1990 · 1 comment · 2 assignees · Opened Apr 23, 2025

• Geothermal Heat Pump Follow-up Issues

  May be free again @yzhou601 claimed this 559 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#1978 · 2 comments · 1 assignee · Opened Apr 9, 2025

• Mains water temperature too high for HI

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

  NatLabRockies/OpenStudio-HPXML#1977 · 4 comments · Opened Apr 8, 2025

• Update to ASHRAE 2025 design conditions

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

  NatLabRockies/OpenStudio-HPXML#1970 · 1 comment · Opened Mar 27, 2025

• Stochastic schedules for EV charging w/ `PlugLoad` approach

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

  NatLabRockies/OpenStudio-HPXML#1962 · 1 comment · Opened Mar 20, 2025

• Resample schedule files when output report resolution is lower than simulation resolution

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

  NatLabRockies/OpenStudio-HPXML#1957 · 1 comment · Opened Mar 14, 2025

• Error running OSW with schedule CSV

  May be free again @joseph-robertson claimed this 586 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#1956 · 4 comments · 1 assignee · Opened Mar 14, 2025

• Allow sub-hourly unavailable periods

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

  NatLabRockies/OpenStudio-HPXML#1923 · Opened Feb 6, 2025

• Heat pump pool heaters

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

  NatLabRockies/OpenStudio-HPXML#1889 · Opened Nov 25, 2024

• Utility bill calculation enhancements for detailed rates

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

  NatLabRockies/OpenStudio-HPXML#1859 · Opened Oct 16, 2024

• Allow instantaneous water heaters w/ larger tank volumes

  May be free again @shorowit claimed this 735 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#1858 · 2 comments · 1 assignee · Opened Oct 15, 2024

• Replace default operational equations with measured data

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

  NatLabRockies/OpenStudio-HPXML#1839 · Opened Sep 19, 2024

• Allow multiple `CeilingFan` elements

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

  NatLabRockies/OpenStudio-HPXML#1819 · 1 comment · Opened Aug 30, 2024

• ERV/HRV Adjusted Sensible Recovery Efficiency

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

  NatLabRockies/OpenStudio-HPXML#1811 · Opened Aug 22, 2024

• Document `ApplyASHRAE140Assumptions` flag

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  Difficulty 2/5 1-3 hours Newbie friendliness 35/100

  NatLabRockies/OpenStudio-HPXML#1794 · Opened Aug 5, 2024

• Catch impossibly large air infiltration values

  May be free again @shorowit claimed this 804 days ago, and no pull request is open. Open

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  NatLabRockies/OpenStudio-HPXML#1792 · 1 assignee · Opened Aug 1, 2024

• Increase fixtures hot water use when no dishwasher present

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

  NatLabRockies/OpenStudio-HPXML#1787 · 1 comment · 1 reaction · Opened Jul 25, 2024

• Add outputs for mixed hot water usage along with hot water usage

  May be free again A pull request for this issue was closed without being merged. Open

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  hpxml priority low

  Difficulty 3/5 1-2 days Newbie friendliness 45/100

  NatLabRockies/OpenStudio-HPXML#1785 · Opened Jul 24, 2024

• Allow `NeighborBuilding/Azimuth` in any direction (remove restriction)

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

  NatLabRockies/OpenStudio-HPXML#1777 · Opened Jul 12, 2024