Release of Therm 8

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Angus Collins

Dec 18, 2023, 2:14:58 PM12/18/23

I was wondering when the official release for Therm 8 is scheduled, the transient moisture modeling is an exciting addition?

Also can anyone request to help test this version?

Robin Mitchell

Jan 2, 2024, 4:10:57 PMJan 2
to Angus Collins, THERM

I plan to post THERM 8 this week as a "research" version, so that users can test it. However, I wouldn't do "real" work with it until it has been more thoroughly tested by more users. 

I will post a message on this forum when it is up on our website.

Thanks for your interest !


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Robin Mitchell
Building Technology and Urban Systems Division
Energy Technologies Area
Lawrence Berkeley National Laboratory

Speckel Support

Jan 2, 2024, 5:34:18 PMJan 2
to Robin Mitchell, Angus Collins, THERM
THERM 8 has lots of promise but is massively limited by its external boundary constraints. If it cannot account for hourly values over the year, 8760 hours, I cannot see its value in application. Indeed, a min of 5 years is needed for any hygrothermal sim, if not more. Seems to have issues with timesteps greater than 200. As such, it cannot be used against ASHRAE 160 or similar methods. It's only current application is for a couple of weeks over winter, which is not enough time to see moisture related issues.



Darren O’Dea

Director and Co-Founder

Sent on the go... please 🙏 excuse any typos 🙄 or brevity.

From: <> on behalf of Robin Mitchell <>
Sent: Wednesday, January 3, 2024 7:10:43 AM
To: Angus Collins <>
Cc: THERM <>
Subject: Re: [LBNL-THERM] Release of Therm 8

Angus Collins

Jan 15, 2024, 6:06:10 PMJan 15
Hi Robin,

That would be great, using it for long term hygrothermic analysis doesn't seem reasonable at this point, however would an overnight condensation analysis be relatively accurate? It may not be at a point to prove building health, however it can still be used for things like a demonstration to help convince builders to add thermal insulation to an interstitial space behind a partion wall.

Angus Collins.
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