# fairyfly

**URL:** https://discourse.ladybug.tools/c/grasshopper/fairyfly/45.md

[Latest](https://discourse.ladybug.tools/latest.md) · [Categories](https://discourse.ladybug.tools/categories.md) · [Tags](https://discourse.ladybug.tools/tags.md)

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## [About the fairyfly category](https://discourse.ladybug.tools/t/about-the-fairyfly-category/39877)

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**Author:** [@chris](https://discourse.ladybug.tools/u/chris)\
**Replies:** 0

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## [Optional simulation engine in Fairyfly](https://discourse.ladybug.tools/t/optional-simulation-engine-in-fairyfly/40917)

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**Author:** [@Aliarch](https://discourse.ladybug.tools/u/Aliarch)\
**Replies:** 4\
**Last updated:** [November 11, 2026, 11:43am UTC](https://discourse.ladybug.tools/t/optional-simulation-engine-in-fairyfly/40917 "2026-11-11T11:43:56Z")

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Hi @chris . THERM 8 supports two simulation methods: Simulation engine = Steady-State Thermal (ConRad) Simulation engine = Transient Therm + Moisture (HygroThermFEM) But Fairyfly does not have access to select method…

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## [Introducing Fairyfly for THERM Simulation with LBT Grasshopper](https://discourse.ladybug.tools/t/introducing-fairyfly-for-therm-simulation-with-lbt-grasshopper/39878)

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**Author:** [@chris](https://discourse.ladybug.tools/u/chris)\
**Replies:** 10\
**Last updated:** [September 30, 2026, 8:25pm UTC](https://discourse.ladybug.tools/t/introducing-fairyfly-for-therm-simulation-with-lbt-grasshopper/39878 "2026-09-30T20:25:46Z")

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Great members of the Ladybug Tools community, After years of you asking us about the future of the Legacy Honeybee THERM capabilities, we are happy to announce that we have finally added a connection to THERM 8 in the l…

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## [A valid THERM installation was found but it does not have the required redistributable packages](https://discourse.ladybug.tools/t/a-valid-therm-installation-was-found-but-it-does-not-have-the-required-redistributable-packages/40416)

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**Author:** [@Aliarch](https://discourse.ladybug.tools/u/Aliarch)\
**Replies:** 12\
**Last updated:** [May 31, 2026, 11:04am UTC](https://discourse.ladybug.tools/t/a-valid-therm-installation-was-found-but-it-does-not-have-the-required-redistributable-packages/40416 "2026-05-31T11:04:49Z")

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Hi @chris hope your doing well I have installed all the libraries to run THERM. Do you know what this error is for? Solution exception:A valid THERM installation was found at “C:/Program Files (x86)/lbnl/THERM8.1” bu…

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## [Fairyfly - Boundary conditions error](https://discourse.ladybug.tools/t/fairyfly-boundary-conditions-error/39891)

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**Author:** [@AbrahamYezioro](https://discourse.ladybug.tools/u/AbrahamYezioro)\
**Replies:** 7\
**Last updated:** [May 27, 2026, 10:52pm UTC](https://discourse.ladybug.tools/t/fairyfly-boundary-conditions-error/39891 "2026-05-27T22:52:43Z")

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Hi @chris , Still trying to update Legacy Therm files to the new Fairyfly. I’m getting this error: Runtime error (ValueErrorException): THERM simulation failed. Open the thmz file in the THERM interface for more info…

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## [Therm7.8 Compatiblity](https://discourse.ladybug.tools/t/therm7-8-compatiblity/40333)

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**Author:** [@tylerhenderson](https://discourse.ladybug.tools/u/tylerhenderson)\
**Replies:** 6\
**Last updated:** [May 27, 2026, 1:26am UTC](https://discourse.ladybug.tools/t/therm7-8-compatiblity/40333 "2026-05-27T01:26:28Z")

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Hello, I came across this group searching for interoperability solutions with LBNL’s software. I’m wondering if there’s any interest in compatibility with THERM 7.8. I see from the post history that Fairyfly works wit…

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## [Failed to import fairyfly](https://discourse.ladybug.tools/t/failed-to-import-fairyfly/40056)

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**Author:** [@Aliarch](https://discourse.ladybug.tools/u/Aliarch)\
**Replies:** 1\
**Last updated:** [March 2, 2026, 4:50pm UTC](https://discourse.ladybug.tools/t/failed-to-import-fairyfly/40056 "2026-03-02T16:50:22Z")

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Hi @chris . thanks for placing Fairyfly I installed Fairyfly step by step but it seems to be missing from the Ladybug Tools library. All Fairyfly components are facing this error: Solution exception: Failed to import…

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## [Fairyfly could not find the log file](https://discourse.ladybug.tools/t/fairyfly-could-not-find-the-log-file/40144)

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**Author:** [@KantoHiro](https://discourse.ladybug.tools/u/KantoHiro)\
**Replies:** 7\
**Last updated:** [April 28, 2026, 4:36pm UTC](https://discourse.ladybug.tools/t/fairyfly-could-not-find-the-log-file/40144 "2026-04-28T16:36:57Z")

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Thank you for creating such a wonderful tool. Thanks to LBT 10.0, I should be able to conduct further verification. However, I am unable to get the heat transfer simulation in Fairyfly to run properly. I’ve tried vari…

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## [Fairyfly/THERM: Model component turns red when using my custom materials (beginner question)](https://discourse.ladybug.tools/t/fairyfly-therm-model-component-turns-red-when-using-my-custom-materials-beginner-question/40201)

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**Author:** [@Azzaya](https://discourse.ladybug.tools/u/Azzaya)\
**Replies:** 1\
**Last updated:** [April 5, 2026, 11:01am UTC](https://discourse.ladybug.tools/t/fairyfly-therm-model-component-turns-red-when-using-my-custom-materials-beginner-question/40201 "2026-04-05T11:01:38Z")

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I’m a beginner Rhino/Grasshopper + Ladybug Tools user. I’m trying to run a THERM simulation using the new Fairyfly components (THERM 8.1 / LBT 1.10), and I’m currently creating my own custom materials (e.g., mineral wool…

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## [The FF Color Shape Attributes component requires a Visualization Set output](https://discourse.ladybug.tools/t/the-ff-color-shape-attributes-component-requires-a-visualization-set-output/40059)

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**Author:** [@ZhengrongTao](https://discourse.ladybug.tools/u/ZhengrongTao)\
**Replies:** 5\
**Last updated:** [March 6, 2026, 7:07pm UTC](https://discourse.ladybug.tools/t/the-ff-color-shape-attributes-component-requires-a-visualization-set-output/40059 "2026-03-06T19:07:10Z")

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hi, @chris I will soon introduce Fairyfly to the users of my channel for the purpose of conducting two-dimensional heat transfer and thermal bridge analysis.Currently, when I use Fairyfly, everything is working extremel…

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## [A way to integrate thermal bridges in EnergyPlus](https://discourse.ladybug.tools/t/a-way-to-integrate-thermal-bridges-in-energyplus/40029)

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**Author:** [@adrisonet](https://discourse.ladybug.tools/u/adrisonet)\
**Replies:** 4\
**Last updated:** [February 26, 2026, 7:24pm UTC](https://discourse.ladybug.tools/t/a-way-to-integrate-thermal-bridges-in-energyplus/40029 "2026-02-26T19:24:23Z")

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Hello. I’ve been doing a bit of research on similar posts, but I haven’t found anything similar. It’s about linking thermal bridges with EnergyPlus. There is a software for regulation compliance in Spain that uses Ener…

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## [Add Gravity Arrow?](https://discourse.ladybug.tools/t/add-gravity-arrow/39989)

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**Author:** [@grahamjlinn](https://discourse.ladybug.tools/u/grahamjlinn)\
**Replies:** 8\
**Last updated:** [February 23, 2026, 7:31pm UTC](https://discourse.ladybug.tools/t/add-gravity-arrow/39989 "2026-02-23T19:31:16Z")

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Hi Chris! We’re wondering if its possible to expose the Gravity arrow input in fairyfly… we’re doing NFRC calcs and realized we have to jump out and manually set the gravity arrow in THERM and resimulate… unless there is…

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## [U Factor Component Behavior](https://discourse.ladybug.tools/t/u-factor-component-behavior/39998)

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**Author:** [@grahamjlinn](https://discourse.ladybug.tools/u/grahamjlinn)\
**Replies:** 3\
**Last updated:** [February 19, 2026, 7:30pm UTC](https://discourse.ladybug.tools/t/u-factor-component-behavior/39998 "2026-02-19T19:30:55Z")

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Hi Chris - some unexpected behavior happening in the U Factor component In the attached detail/script, when I set the U Factor to “Projected in Glass Plane”, THERM doesn’t interpret the glass plane correctly, it basical…

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## [Fairyfly - Curved Lines](https://discourse.ladybug.tools/t/fairyfly-curved-lines/39969)

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**Author:** [@grahamjlinn](https://discourse.ladybug.tools/u/grahamjlinn)\
**Replies:** 4\
**Last updated:** [February 13, 2026, 12:15am UTC](https://discourse.ladybug.tools/t/fairyfly-curved-lines/39969 "2026-02-13T00:15:53Z")

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Hi All - sorry if this is a super obvious THERM limitation that I am just catching up to I am importing DWG objects and running into issues. The DWG shape has curved lines and it appears Fairfly is attempting to convert…

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## [Fairyfly - Best practices](https://discourse.ladybug.tools/t/fairyfly-best-practices/39904)

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**Author:** [@AbrahamYezioro](https://discourse.ladybug.tools/u/AbrahamYezioro)\
**Replies:** 12\
**Last updated:** [February 10, 2026, 8:56pm UTC](https://discourse.ladybug.tools/t/fairyfly-best-practices/39904 "2026-02-10T20:56:19Z")

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Hi @chris , This time i want to as for your advice regarding best practices. Instead of solving a specific problem, i rather want to know how to proceed in general. This is going to be PART 1 of this thread … This time…

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## [Fairyfly user feedback](https://discourse.ladybug.tools/t/fairyfly-user-feedback/39890)

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**Author:** [@Gspahr](https://discourse.ladybug.tools/u/Gspahr)\
**Replies:** 9\
**Last updated:** [February 5, 2026, 10:51am UTC](https://discourse.ladybug.tools/t/fairyfly-user-feedback/39890 "2026-02-05T10:51:30Z")

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Hello everyone, first off a huge and hearfelt THANK YOU :smiling\_face\_with\_tear: to everyone who contributed to making Fairyfly! I’m very excited about the new tool, which is why I tried it out as soon as possible. I’d l…

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## [Correct method for choosing / drawing / identifying U-Factor Tags](https://discourse.ladybug.tools/t/correct-method-for-choosing-drawing-identifying-u-factor-tags/39941)

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**Author:** [@remyweather](https://discourse.ladybug.tools/u/remyweather)\
**Replies:** 1\
**Last updated:** [February 6, 2026, 7:24pm UTC](https://discourse.ladybug.tools/t/correct-method-for-choosing-drawing-identifying-u-factor-tags/39941 "2026-02-06T19:24:18Z")

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This is a correct methods question from someone fairly new to Therm modelling. I am a bit unclear still on the correct methodology / process to choosing my u-factor tags and would love some help. I was looking through t…

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## [Hole Found, but no hole found - Simple CW - Modelling practices?](https://discourse.ladybug.tools/t/hole-found-but-no-hole-found-simple-cw-modelling-practices/39911)

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**Author:** [@remyweather](https://discourse.ladybug.tools/u/remyweather)\
**Replies:** 24\
**Last updated:** [February 5, 2026, 2:51am UTC](https://discourse.ladybug.tools/t/hole-found-but-no-hole-found-simple-cw-modelling-practices/39911 "2026-02-05T02:51:08Z")

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It is highly probable that I am doing something wrong, but: I have this very simple CW, inside boundary and outside boundary. Solution exception:The Shapes of the input model do not form a contiguous region without…

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## [What does it mean to have a U-Factor at a Point](https://discourse.ladybug.tools/t/what-does-it-mean-to-have-a-u-factor-at-a-point/39901)

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**Author:** [@remyweather](https://discourse.ladybug.tools/u/remyweather)\
**Replies:** 5\
**Last updated:** [January 29, 2026, 5:54pm UTC](https://discourse.ladybug.tools/t/what-does-it-mean-to-have-a-u-factor-at-a-point/39901 "2026-01-29T17:54:18Z")

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Fantastic update and I am already using it. Question @mostapha @chris is it possible to get the U Value or calculation results on a particular point or custom line (say drawn through the assembly) in rhino rather than…

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## [Fairyfly - Unknown material error](https://discourse.ladybug.tools/t/fairyfly-unknown-material-error/39886)

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**Author:** [@AbrahamYezioro](https://discourse.ladybug.tools/u/AbrahamYezioro)\
**Replies:** 3\
**Last updated:** [January 26, 2026, 8:03am UTC](https://discourse.ladybug.tools/t/fairyfly-unknown-material-error/39886 "2026-01-26T08:03:48Z")

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Hi \[@chris \], Translating my old Legacy Therm files to the new FF, I get this error on many of them: Runtime error (ValueErrorException): THERM simulation failed. Open the thmz file in the THERM interface for more info…